ci: Add PR lint to repo

[andreaangiolillo]

Description

Jira ticket: INTMDB-934

This PR adds a GitHub action to check that the PR follows Conventional Commits.
See CONTRIBUTING.md for a full list of available formats.

Summary of the format to use:

• fix: description of the ticket: this correlates with PATCH in Semantic Versioning
• feat: description of the ticket: this correlates with MINOR in Semantic Versioning
• BREAKING CHANGE: a commit that has a footer BREAKING CHANGE: or appends a ! after the type/scope, introduces a breaking API change (correlating with MAJOR in Semantic Versioning). A BREAKING CHANGE can be part of commits of any type.
  Examples:
  • fix!: description of the ticket
  • If the PR has BREAKING CHANGE: in its description is a breaking change

Type of change:

• Bug fix (non-breaking change which fixes an issue). Please, add the "bug" label to the PR.
• New feature (non-breaking change which adds functionality). Please, add the "enhancement" label to the PR.
• Breaking change (fix or feature that would cause existing functionality to not work as expected). Please, add the "breaking change" label to the PR.
• This change requires a documentation update
• Documentation fix/enhancement

Required Checklist:

• I have signed the MongoDB CLA
• I have read the contribution guidelines
• I have added tests that prove my fix is effective or that my feature works per HashiCorp requirements
• I have added any necessary documentation (if appropriate)
• I have run make fmt and formatted my code

Further comments