Add rust bindings and bump cffi dep to 2.0

Skip request parsing by default, centralise configs

0.11.0

GJ-63 Always perform mars request expansion on C API / pygribjump
GJ-62 Migrate pytests to new pyfdb API

0.10.4

- Remove deprecated metkit MarsExpansion.
- Use metkit's new codes handle interface.
- In tests, set eccodes missing value explicitly to 9999.

Improvements to logging and some changes to python deps

Support scanning of GRIB files ending in an incomplete message

Improve scan-files tool to merge into existing indexes

Extraction iterator API

Fix for callback_vs_scan test

Use multiple short-lived FDB objects in parallel

Faster jumpinfo generation for ccsds fields

Tidy up of ccsds code