add http/2 support

[epi052]

closes #947

Landing a Pull Request (PR)

Long form explanations of most of the items below can be found in the CONTRIBUTING guide.

Branching checklist

• There is an issue associated with your PR (bug, feature, etc.. if not, create one)
• Your PR description references the associated issue (i.e. fixes #123456)
• Code is in its own branch
• Branch name is related to the PR contents
• PR targets main

Static analysis checks

• All rust files are formatted using cargo fmt
• All clippy checks pass when running cargo clippy --all-targets --all-features -- -D warnings -A clippy::mutex-atomic
• All existing tests pass

Documentation

• New code is documented using doc comments
• Documentation about your PR is included in the docs, as needed. The docs live in a separate repository. Update the appropriate pages at the links below.
  • update example config file section
  • update help output section
  • add an example
  • update comparison table

Additional Tests

• New code is unit tested
• New code is integration tested, as needed
• New tests pass