Move cobalt http caching code to //cobalt.

[aee-google]

b/313661860

[andrewsavage1]

@jellefoks could you take a look at this as well? I don't have much pre-existing knowledge about caching so while a lot of this looks fine, some of it is definitely foreign

[codecov]

Codecov Report

Attention: 146 lines in your changes are missing coverage. Please review.

Comparison is base (35fd0c5) 58.64% compared to head (202ac82) 58.47%.
Report is 4 commits behind head on main.

❗ Current head 202ac82 differs from pull request most recent head 2cd3326. Consider uploading reports for the commit 2cd3326 to get more accurate results

Files	Patch %	Lines
cobalt/h5vcc/h5vcc_storage.cc	0.00%	51 Missing ⚠️
cobalt/network/disk_cache/cobalt_disk_cache.cc	0.00%	31 Missing ⚠️
cobalt/network/disk_cache/cobalt_backend_impl.cc	0.00%	22 Missing ⚠️
cobalt/cache/cache.cc	68.42%	12 Missing ⚠️
cobalt/network/url_request_context.cc	18.18%	9 Missing ⚠️
cobalt/loader/net_fetcher.cc	20.00%	4 Missing ⚠️
cobalt/loader/script_loader_factory.cc	0.00%	4 Missing ⚠️
...obalt/network/disk_cache/cobalt_backend_factory.cc	33.33%	4 Missing ⚠️
cobalt/network/disk_cache/cobalt_backend_impl.h	0.00%	3 Missing ⚠️
...obalt/worker/service_worker_persistent_settings.cc	0.00%	3 Missing ⚠️
... and 3 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2047      +/-   ##
==========================================
- Coverage   58.64%   58.47%   -0.18%     
==========================================
  Files        1902     1908       +6     
  Lines       94044    93857     -187     
==========================================
- Hits        55155    54885     -270     
- Misses      38889    38972      +83     

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[andrewsavage1]

I saw some evergreen presubmits failing—I assume those are failing in trunk too?