JSON Schema with Dot-Fieldnames

[kestarumper]

This PR closes #963.

NOTE: This is yet another approach that works, but will probably be changed.

When I was working on the implementation of 2 and 2.5 I encountered some problems which would make the API inconvenient. Instead, I implemented the escape paths. This is more convenient when used with React because you can pass a string to the name prop instead of an array.

Given schema

{
    "$schema": "http://json-schema.org/draft-06/schema#",
    "type": "object",
    "properties": {
      "x": {
        "type": "object",
        "properties": {
          "y.z": {
            "type": "string"
          }
        }
      }
    }
}

we can access it like the following

<AutoField name='x.["y.z"]' />

You can escape the path with brackets like normal.["path.with.dots.in.name"].second.["another.path.with.dots"].0.

[codecov]

Codecov Report

Merging #1078 (a54a7fb) into master (80b6a38) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1078   +/-   ##
=======================================
  Coverage   98.60%   98.60%           
=======================================
  Files         203      203           
  Lines        3217     3225    +8     
  Branches      829      832    +3     
=======================================
+ Hits         3172     3180    +8     
  Partials       45       45           

Impacted Files	Coverage Δ
...niforms-bridge-json-schema/src/JSONSchemaBridge.ts	100.00% <100.00%> (ø)
packages/uniforms/src/joinName.ts	100.00% <100.00%> (ø)

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[radekmie]

1. What if a field is called [""]? I know, it's a terrible name, but it's possible.
2. More generally, what if the field contains an arbitrary number of [""]? Like, [""][""], ["[""]"], or ["[""]"]["[""]"]?