fix(resource): allow empty string as query param value

[gdostie]

Making a few corrections to the Search API calls to /document and /html endpoints:

• Added missing query parameters on getDocument (they were missing on the swagger doc as well, see SEARCHAPI-8913)
• Allow to pass in the empty pipeline as parameter to getDocument (previously empty string query params we're removed so it was not possible)
• Use POST endpoint for previewHTML instead of GET. Allows to pass in the full rest parameters in the body, which unlocks all the available features of this endpoint.

I also cleaned up the interfaces a bit by declaring a shared params interface and reusing it where possible. This way we avoid having to repeat the lengthy jsdocs everywhere. Still not perfect, but now we have a few repetitions less 🤷

Acceptance Criteria

• My changes are publicly available, documented, and deployed in production. (i.e. on Swagger)
  Soon (see SEARCHAPI-8913)
• JSDoc annotates each property added in the exported interfaces
• The proposed changes are covered by unit tests
• Commits containing breaking changes a properly identified as such
• README.md is adjusted to reflect the proposed changes (if relevant)
• My merge commit message will be conventional (See Conventional Commit)

[github-actions]

🎉 This PR is included in version 47.0.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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