Add key for block coverage, tests

[ranweiler]

Add a blocks subkey to the binary block coverage JSON schema, and test conversions. This will make it easier to add new per-module metadata in the future, if needed.

Old:

{
    "/setup/main.exe": {
        "1": 0,
        "12c": 1,
        "1388": 0
    },
    "/setup/lib/some.dll": {
        "7b": 0,
        "1c8": 10
    }
}

New:

{
    "/setup/main.exe": {
        "blocks": {
            "1": 0,
            "12c": 1,
            "1388": 0
        }
    },
    "/setup/lib/some.dll": {
        "blocks": {
            "7b": 0,
            "1c8": 10
        }
    }
}

[codecov-commenter]

Codecov Report

Merging #2715 (be454a6) into main (1726bed) will increase coverage by 0.13%.
The diff coverage is 46.15%.

@@            Coverage Diff             @@
##             main    #2715      +/-   ##
==========================================
+ Coverage   28.44%   28.57%   +0.13%     
==========================================
  Files         319      319              
  Lines       38023    38026       +3     
==========================================
+ Hits        10815    10866      +51     
+ Misses      27208    27160      -48     

Impacted Files	Coverage Δ
...gent/onefuzz-file-format/src/coverage/binary/v1.rs	51.85% <36.36%> (+51.85%)	⬆️
src/agent/coverage/src/binary.rs	5.55% <100.00%> (+5.55%)	⬆️
src/agent/debuggable-module/src/lib.rs	7.14% <0.00%> (+3.57%)	⬆️
src/agent/debuggable-module/src/path.rs	20.33% <0.00%> (+20.33%)	⬆️
...gent/onefuzz-file-format/src/coverage/binary/v0.rs	51.61% <0.00%> (+41.93%)	⬆️
src/agent/onefuzz-file-format/src/hex.rs	53.33% <0.00%> (+53.33%)	⬆️

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