Job.build(Map<String, String> params) results in HTTP 414 (URI too long)

I've had problems with requests for a parameterized job build:

```
org.apache.http.client.HttpResponseException: Request-URI Too Long
at com.offbytwo.jenkins.client.validator.HttpResponseValidator.validateResponse(HttpResponseValidator.java:11)
at com.offbytwo.jenkins.client.JenkinsHttpClient.post(JenkinsHttpClient.java:232)
at com.offbytwo.jenkins.model.Job.build(Job.java:125)
at com.offbytwo.jenkins.model.Job.build(Job.java:112)
```

Looking at the code, I noticed that `Job.build` encodes the job parameter/values in the URL.
This can result in a very long URL that exceeds the server's max URL size.

I worked around this problem outside of the library by submitting a POST request where the job parameter/values are passed as form data instead of encoded in the url.

Start in Job.java at the parameterized Job.build overloads and follow the request into JenkinsHttpClient.post. Check how parameter names and values are currently encoded, then compare that with the reported form-data workaround. Done means parameterized builds use a request representation that avoids HTTP 414 for long values while preserving the parameters.

Written by the indexing model from the issue text.