Support the special character '.' in header names

Background

HTTP header field names can contain the character . according to this RFC and the definition of a token within.
However, httpyac fails to properly parse an .http file with such a header name.

Although commonly used header names have dashes, certain web services can require custom header names. httpyac should fully support the RFC, especially for proper interoperability with the IntelliJ REST Client plugin.

Example http File

GET https://google.com
header.name: xyz

Executing httpyac with such a file, the following error report can be observed:

ExecuteHook: httpClient failed
RequestError: The `GET` method cannot be used with a body
    at Request._destroy (D:\projects\sandboxes\httpyac-test\node_modules\got\dist\source\core\index.js:1378:21)
    at _destroy (node:internal/streams/destroy:102:25)
    at Request.destroy (node:internal/streams/destroy:64:5)
    at D:\projects\sandboxes\httpyac-test\node_modules\got\dist\source\core\index.js:354:26
    at Request._finalizeBody (D:\projects\sandboxes\httpyac-test\node_modules\got\dist\source\core\index.js:716:23)
    at D:\projects\sandboxes\httpyac-test\node_modules\got\dist\source\core\index.js:333:28
    at new Request (D:\projects\sandboxes\httpyac-test\node_modules\got\dist\source\core\index.js:357:11)
    at makeRequest (D:\projects\sandboxes\httpyac-test\node_modules\got\dist\source\as-promise\index.js:35:29)
    at D:\projects\sandboxes\httpyac-test\node_modules\got\dist\source\as-promise\index.js:147:9
    at D:\projects\sandboxes\httpyac-test\node_modules\p-cancelable\index.js:63:11
    at new Promise (<anonymous>)
    at new PCancelable (D:\projects\sandboxes\httpyac-test\node_modules\p-cancelable\index.js:31:19)
    at Object.asPromise [as default] (D:\projects\sandboxes\httpyac-test\node_modules\got\dist\source\as-promise\index.js:33:21)
    at getPromiseOrStream (D:\projects\sandboxes\httpyac-test\node_modules\got\dist\source\create.js:43:121) {
  code: 'ERR_GOT_REQUEST_ERROR',
  timings: undefined
}

as the parsing of the file breaks and header.name: xyz is now considered as the request body.

[AnWeber]

Here is the fieldValueRegExp used by JSDOM: https://github.com/jsdom/jsdom/blob/master/lib/jsdom/living/xhr/XMLHttpRequest-impl.js#L34.

[AnWeber]

This regex is the culprit: https://github.com/AnWeber/httpyac/blob/main/src/parser/parserRegex.ts#L62. I will extend according to the RFC.