Add support for nested map property names in errors.

[veleek]

For the following JSON where the value property is limited to 2048 chars:

{
  "data": {
    "gameType": {
      "value": "Something longer than 2048chars...",
    },
  }
}

Example error before change:

value in body should be at most 2048 chars long.

Example error after change:

data.gameType.value in body should be at most 2048 chars long.

Fixes #2684

[veleek]

I have no idea why the circleci build is failing... it seems unrelated to this change.

[veleek]

FYI @casualjim, this is essentially building on #2684.

[veleek]

I believe I forgot to verify the tests last time around. I'll try to take a look at them tomorrow.

[casualjim]

I fixed the build on master, if you update your base branch the tests should be passing

[codecov]

Codecov Report

Merging #2685 (3e2cb9f) into master (9102404) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2685   +/-   ##
=======================================
  Coverage   82.94%   82.94%           
=======================================
  Files          54       54           
  Lines        9524     9524           
=======================================
  Hits         7900     7900           
  Misses       1112     1112           
  Partials      512      512           

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