feat: Create car-mirror-reqwest crate & add high-level streaming functions

[matheus23]

TODO

• Documentation for pull::handle_request_streaming and push::request_streaming
• Module-level doctests in car-mirror to show how the request loop works
• Module-level doctests in car-mirror-reqwest to show how to make a request against a simple axum server (this turned into a compilation doctest & the axum example instead)

[codecov]

Codecov Report

Attention: 113 lines in your changes are missing coverage. Please review.

Comparison is base (bb5a166) 53.13% compared to head (498004e) 50.65%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #42      +/-   ##
==========================================
- Coverage   53.13%   50.65%   -2.48%     
==========================================
  Files          12       15       +3     
  Lines         559      758     +199     
  Branches      249      358     +109     
==========================================
+ Hits          297      384      +87     
- Misses         59       65       +6     
- Partials      203      309     +106     

Files	Coverage Δ
car-mirror-reqwest/src/lib.rs	100.00% <100.00%> (ø)
car-mirror/src/cache.rs	60.41% <ø> (+2.08%)	⬆️
car-mirror/src/lib.rs	100.00% <ø> (ø)
car-mirror/src/incremental_verification.rs	52.94% <0.00%> (-0.64%)	⬇️
car-mirror/src/pull.rs	68.42% <68.42%> (ø)
car-mirror/src/push.rs	67.50% <66.66%> (-0.93%)	⬇️
car-mirror/src/test_utils/local_utils.rs	37.50% <0.00%> (-6.41%)	⬇️
car-mirror/src/common.rs	53.16% <34.78%> (-3.38%)	⬇️
car-mirror-reqwest/src/request.rs	54.23% <54.23%> (ø)
car-mirror-reqwest/integration/axum.rs	29.41% <29.41%> (ø)

... and 1 file with indirect coverage changes