Throw helpful error when `number` option is invalid

### Please avoid duplicates

- [X] I checked [all open bugs](https://github.com/gr2m/github-project/issues?q=is%3Aissue+is%3Aopen+label%3Abug) and none of them matched my problem.

### Reproducible test case

_No response_

### Please select the environment(s) that are relevant to your bug report

- [X] Browsers
- [X] Node
- [X] Deno

### Versions

any

### What happened?

I received the following cryptic error

```
/[path]/node_modules/@octokit/graphql/dist-node/index.js:81
throw new GraphqlResponseError(requestOptions, headers, response.data);
^

GraphqlResponseError: Request failed due to following response errors:
- Variable $number of type Int! was provided invalid value
at /[path]/node_modules/@octokit/graphql/dist-node/index.js:81:13
at async getStateWithProjectItems (file:///[path]/node_modules/github-project/api/lib/get-state-with-project-items.js:22:7)
at async updateItemByContentId (file:///[path]/node_modules/github-project/api/items.update-by-content-id.js:23:26)
at async run (file:///[path]/actions/automate-type-labels/automate-type-labels.js:208:3) {
request: {
query: '\n' +
' query getProjectWithItems($org: String!,$number: Int!) {\n' +
' organization(login: $org) {\n' +
' projectNext(number: $number) {\n' +
' \n' +
' id\n' +
' title\n' +
' description\n' +
' url\n' +
' fields(first: 50) {\n' +
' nodes {\n' +
' id\n' +
' name\n' +
' settings\n' +
' }\n' +
' }\n' +
'\n' +
' items(first: 100) {\n' +
' nodes {\n' +
' \n' +
' id\n' +
' \n' +
' content {\n' +
' __typename\n' +
' ... on Issue {\n' +
' \n' +
' id\n' +
' number\n' +
' title\n' +
' createdAt\n' +
' databaseId\n' +
' assignees(first:10) {\n' +
' nodes {\n' +
' login\n' +
' }\n' +
' }\n' +
' labels(first:10){\n' +
' nodes {\n' +
' name\n' +
' }\n' +
' }\n' +
' closed\n' +
' closedAt\n' +
' createdAt\n' +
' milestone {\n' +
' number\n' +
' title\n' +
' state\n' +
' }\n' +
' repository {\n' +
' name\n' +
' }\n' +
'\n' +
' }\n' +
' ... on PullRequest {\n' +
' \n' +
' id\n' +
' number\n' +
' title\n' +
' createdAt\n' +
' databaseId\n' +
' assignees(first:10) {\n' +
' nodes {\n' +
' login\n' +
' }\n' +
' }\n' +
' labels(first:10){\n' +
' nodes {\n' +
' name\n' +
' }\n' +
' }\n' +
' closed\n' +
' closedAt\n' +
' createdAt\n' +
' milestone {\n' +
' number\n' +
' title\n' +
' state\n' +
' }\n' +
' repository {\n' +
' name\n' +
' }\n' +
'\n' +
' merged\n' +
' }\n' +
' }\n' +
'\n' +
' fieldValues(first: 20) {\n' +
' nodes {\n' +
' value\n' +
' projectField {\n' +
' id\n' +
' }\n' +
' }\n' +
' }\n' +
'\n' +
' }\n' +
' }\n' +
' }\n' +
' }\n' +
' }\n',
variables: { org: 'my-org', number: NaN }
},
headers: {
'access-control-allow-origin': '*',
'access-control-expose-headers': 'ETag, Link, Location, Retry-After, X-GitHub-OTP, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Used, X-RateLimit-Resource, X-RateLimit-Reset, X-OAuth-Scopes, X-Accepted-OAuth-Scopes, X-Poll-Interval, X-GitHub-Media-Type, X-GitHub-SSO, X-GitHub-Request-Id, Deprecation, Sunset',
connection: 'close',
'content-encoding': 'gzip',
'content-security-policy': "default-src 'none'",
'content-type': 'application/json; charset=utf-8',
date: 'Wed, 09 Mar 2022 01:20:24 GMT',
'github-authentication-token-expiration': '2022-04-04 21:49:00 UTC',
'referrer-policy': 'origin-when-cross-origin, strict-origin-when-cross-origin',
server: 'GitHub.com',
'strict-transport-security': 'max-age=31536000; includeSubdomains; preload',
'transfer-encoding': 'chunked',
vary: 'Accept-Encoding, Accept, X-Requested-With',
'x-accepted-oauth-scopes': 'repo',
'x-content-type-options': 'nosniff',
'x-frame-options': 'deny',
'x-github-media-type': 'github.v3; format=json',
'x-github-request-id': 'F6D7:7E08:1B40BEB:37F130A:622800D7',
'x-oauth-scopes': 'notifications, repo',
'x-ratelimit-limit': '5000',
'x-ratelimit-remaining': '5000',
'x-ratelimit-reset': '1646792424',
'x-ratelimit-resource': 'graphql',
'x-ratelimit-used': '0',
'x-xss-protection': '0'
},
response: {
errors: [
{
extensions: { value: null, problems: [ [Object] ] },
locations: [ { line: 2, column: 43 } ],
message: 'Variable $number of type Int! was provided invalid value'
}
]
},
errors: [
{
extensions: {
value: null,
problems: [ { path: [], explanation: 'Expected value to not be null' } ]
},
locations: [ { line: 2, column: 43 } ],
message: 'Variable $number of type Int! was provided invalid value'
}
],
data: undefined
}
```

What I expected instead is that the `new Project()` constructor should throw immediately when an invalid number was passed

### Would you be interested in contributing a fix?

- [ ] yes

Start at the `new Project()` constructor and trace how its `number` option reaches the GitHub Projects request shown in the stack trace. Confirm the constructor handles an invalid number immediately, and verify that valid project numbers still reach the request correctly.

Written by the indexing model from the issue text.