[Chores] Automated API doc generation and added packages/samples filter

[illiakovalenko]

• This PR follows the Contribution Guide
• Changelog updated

Description / Motivation

• Added "generate API docs" pipeline step:
  • Generates API docs only for packages that were affected by the changes in PR
  • Commits and pushes them using '[skip ci]' identifier
  • Will be triggered ONLY for dev|release branches, since doc generation provides many changes by updating hash numbers for all of the files in a specific package, in this case, each PR will include many changed files that will complicate PR for review
• Introduced lint-samples script that triggers lint step ONLY for the samples that were directly affected by the changes in PR
• Added lerna --since flag for generate-docs and lint-packages to include ONLY packages that were directly affected by the changes in PR
• Our internal release-prep script needs to be updated to replace "--since=origin/dev" by "--since=origin/release/x"

Testing Details

• Unit Test Added
• Manual Test/Other (Please elaborate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

[ambrauer]

Looks great, love the optimization to samples linting. See some comments.

[ambrauer]

👍