htsget-axum-v0.1.0

Added

• (axum) add join handle helper functions

Fixed

• (axum) enable http2 support, re-word docs to include htsget-axum

Other

• update rust msrv
• (axum) add server tests for axum ticket server
• add routers for data and ticket servers
• move the data server to its own htsget-axum crate