htsget-test-v0.2.0

Added

• (test) add multiple resolvers for server tests and test resolution
• use serve_at in data server rather than a constant
• (config) add automatic config inference for local and s3 storage, and rearrange modules
• [breaking] simplify storage config by allowing untagged enum representation

Other

• [breaking] move htsget structs to config, and resolve storage type in config