fix: added dokka and fix doc generation

[kikoso]

This PR fixes the doc generation, broken since 3.4.0.

JavaDoc does not like Kotlin, so we are updating it to a more modern documentation framework, Dokka. We are adding also a new flow to upload the documentation to the GitHub pages.

---

Before submitting your PR, there are a few things you can do to make sure it goes smoothly:

• [X] Make sure to open a GitHub issue as a bug/feature request before writing your code! That way we can discuss the change, evaluate designs, and agree on the general idea
• [X] Edit the title of this pull request with a semantic commit prefix (e.g. "fix: "), which is necessary for automated release workflows to decide whether to generate a new release and what type it should be.
• [ ] Will this cause breaking changes to existing Java or Kotlin integrations? If so, ensure the commit has a BREAKING CHANGE footer so when this change is integrated a major version update is triggered. See: https://www.conventionalcommits.org/en/v1.0.0/
• [X] Ensure the tests and linter pass
• [X] Code coverage does not decrease (if any source code was changed)
• [X] Appropriate docs were updated (if necessary)

Fixes #1248 🦕

[googlemaps-bot]

:tada: This PR is included in version 3.6.1 :tada:

The release is available on:

• v3.6.1
• GitHub release

Your semantic-release bot :package::rocket: