Add HSTS headers to the web server

[vlasebian]

Summary

Add HSTS headers to the web server.

Changes

• Implement web middleware for HSTS header
• Add the middleware to the web server

Testing

Steps

Unit testing.

Results

Regressions

None.

Notes for Reviewers

I did not make the header values configurable. The values are standard and adding the HSTS fields to the configuration does not add any benefit IMO, but I don't have any strong opinion against it either.

Checklist

• Scope: The referenced issue is addressed, there are no unrelated changes.
• Compatibility: The changes are backwards compatible with existing API, storage, configuration and CLI, according to the compatibility commitments in README.md for the chosen target branch.
• Documentation: Relevant documentation is added or updated.
• Testing: The steps/process to test this feature are clearly explained including testing for regressions.
• Infrastructure: If infrastructural changes (e.g., new RPC, configuration) are needed, a separate issue is created in the infrastructural repositories.
• Changelog: Significant features, behavior changes, deprecations and fixes are added to CHANGELOG.md.
• Commits: Commit messages follow guidelines in CONTRIBUTING.md, there are no fixup commits left.

[KrishnaIyer]

LGTM