Mass renaming proposal

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There are a number of settings, diagnostics, and more that have unclear names that I think can be improved. This issue serves to propose new names for these items so that they can all be tracked in one place and implemented at once to minimize the number of breaking releases that would need to be released.

## Settings
- [ ] `completion.displayContext` -> `completion.peekDefinition`
- There is already a `Peek Definition` command in VS Code that has a similar function and I think naming it the same will help people understand its function without confusing the two as they are triggered entirely differently.
- [ ] `diagnostics.disable` -> [**REMOVE**](https://github.com/sumneko/lua-language-server/issues/1364)
- [ ] `diagnostics.groupFileStatus` -> [**REMOVE**](https://github.com/sumneko/lua-language-server/issues/1364)
- [ ] `diagnostics.groupSeverity` -> [**REMOVE**](https://github.com/sumneko/lua-language-server/issues/1364)
- [ ] `diagnostics.ignoreFiles` -> `diagnostics.diagnoseIgnored`
- [ ] `diagnostics.libraryFiles` -> `diagnostics.diagnoseLibraries`
- [ ] `diagnostics.neededFileStatus` -> `diagnostics.config` [(Rework functionality)](https://github.com/sumneko/lua-language-server/issues/1364)
- [ ] `diagnostics.severity` [(Rework functionality)](https://github.com/sumneko/lua-language-server/issues/1364)
- [ ] `diagnostics.workspaceDelay` -> `diagnostics.delay`
- [ ] `hint.setType` -> `hint.assignType`
- [ ] `hover.enumsLimit` -> `hover.typesLimit`
- [ ] `hover.previewFields` -> `hover.peekFields`
- [ ] `runtime.special` -> `runtime.aliases`
- [ ] `workspace.checkThirdParty` -> [`workspace.checkEnvConfigs`](https://github.com/sumneko/lua-language-server/issues/1384)
- [ ] `workspace.ignoreDir` -> `workspace.ignore`
- [ ] `workspace.library` -> `workspace.libraries`
- [ ] `workspace.maxPreload` -> `workspace.maxFiles`
- [ ] `workspace.preloadFileSize` -> `workspace.maxFileSize`
- [ ] `workspace.userThirdParty` -> [`workspace.envConfig`](https://github.com/sumneko/lua-language-server/issues/1384)

## Diagnostics
I imagine there is a good reason `abiguity-1` is named how it is 😄 I see they all have at least 1 hyphen so I guess that is a limitation with how they are parsed?

- [ ] `unknown-diag-code` -> `unknown-diagnostic`
- [ ] `cast-local-type` -> `local-cast-mismatch`

## Syntax Errors
Luckily these can probably be changed with very little impact on the user and most people likely would not have any settings related to these.
- [ ] `err-assign-as-eq` -> `assign-with-equals`
- [ ] `err-c-long-comment` -> `multiline-comment-prefix`
- [ ] `err-comment-prefix` -> `comment-prefix`
- [ ] `err-do-as-then` -> `then-as-do`
- [ ] `err-eq-as-assign` -> `equality-with-assign`
- [ ] `err-esc` -> `unknown-escape`
- [ ] `err-nonstandard-symbol` -> `non-standard-symbol`
- [ ] `err-then-as-do` -> `do-as-then`
- [ ] `exp-in-action` -> `unexpected-expression`
- [ ] `keyword` -> `reserved`
- [ ] `miss-esc-x` -> `miss-hex-value`
- [ ] `miss-exp` -> `miss-expression`

`newfield-call` and `newline-call` are not easy to understand but I can't think of anything that does a better job 🤔

~~I don't even know what these do: `unexpect-efunc-name`, `unexpect-lfunc-name`~~

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Please let me know what you think and feel free to suggest other names.

Inizia esaminando le impostazioni, i codici diagnostici e le rinominazioni degli errori di sintassi proposti in questa issue, insieme alle issue collegate #1364 e #1384. Determina innanzitutto quali nomi e quali modifiche alle funzionalità siano accettati; per considerare il lavoro completato sarebbe necessario un piano di ridenominazione completo e concordato, non una modifica isolata.

Scritto dal modello di indicizzazione a partire dal testo della issue.