feat: align repo with chart template

[jaygridley]

This pull request introduces a comprehensive set of improvements to the project's community standards, contribution process, and continuous integration (CI) workflows. The changes establish clear guidelines for contributors, standardize issue and pull request templates, and implement robust CI pipelines for testing, linting, and releasing Helm charts.

The most important changes include:

Community Standards and Contribution Guidelines:

• Added a Contributor Covenant Code of Conduct to set expectations for behavior and enforcement within the community. (.github/CODE_OF_CONDUCT.md)
• Introduced a detailed contributing guide outlining the pull request process, semantic commit conventions, and checklist requirements for contributions. (.github/CONTRIBUTING.md)

Issue and Pull Request Templates:

• Added standardized issue templates for bug reports and feature requests, as well as a pull request template to ensure consistency and completeness in reporting and reviewing changes. (.github/ISSUE_TEMPLATE/bug_report.yml, .github/ISSUE_TEMPLATE/feature_request.yml, .github/PULL_REQUEST_TEMPLATE.md) [1] [2] [3]
• Enabled blank issues for flexibility in issue reporting. (.github/ISSUE_TEMPLATE/config.yml)

Continuous Integration and Automation:

• Implemented CI workflows for pull requests, including pre-commit checks, linting, chart testing, and automated releases of Helm charts. (.github/workflows/pull-request.yaml)
• Added supporting workflows for cache warmup, cleanup of Helm chart packages on PR closure, and metadata collection to optimize and maintain the CI process. (.github/workflows/cache-warmup.yaml, .github/workflows/cleanup.yaml, .github/workflows/metadata-collector.yaml) [1] [2] [3]