More super randomized `fields` tests

[nik9000]

In #70278 I implemented a bunch of randomized tests for the fields API. In particular, all extensions of MapperTestCase must override generateRandomInputValue to generate a random input value to test. Once they do that they get fields tests for free. Here are some follow ups:

• [ ] Finish implementing generateRandomInputValue
  • [ ] _doc_count @jtibshirani
  • [x] #96742
  • [x] binary (@mayya-sharipova #70826)
  • [ ] geo_point
  • [ ] geo_shape
  • [ ] geo_shape with doc values
  • [ ] flattened @jtibshirani
  • [ ] histogram
  • [ ] aggregate_metric_double
  • [ ] point
  • [ ] shape
  • [x] #96761
• [ ] Come up with a way to assert something for fields that don't have useful doc values
  • [ ] text
  • [ ] annotated_text
  • [ ] completion
  • [ ] search_as_you_type
  • [ ] range (See #70269)
  • [ ] icu_collation_keyword
  • [ ] rank_feature
  • [ ] rank_features
• [x] Fix round trip test for half_float_point. We fixed the fetcher already but the test still assumes a still busted fetcher. (@nik9000 #70937)
• [ ] Fix rounding for longs sent as floating point numbers in the json (#70585)

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