Add JSON output support to Emboss text format#237
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Add a `json` mode to TextOutputOptions so any view can be serialized as JSON, e.g. `WriteToString(view, TextOutputOptions().Json(true))`: - Field names are quoted and values are comma-separated; comments are suppressed. Compact output by default; multiline JSON places each field on its own indented line. - Enums serialize as quoted names (or bare numbers when the value has no name); bool as true/false; NaN and Infinity as quoted strings. - comments(), digit_grouping(), and numeric_base() automatically return JSON-appropriate values when json() is set, so callers don't have to special-case JSON throughout. - Integers wider than 32 bits -- and the numeric form of unnamed enum values whose underlying type is wider than 32 bits -- are serialized as quoted strings by default (JsonLargeIntegerHandling::kLargeAsString), avoiding silent precision loss in JSON parsers that treat all numbers as IEEE-754 doubles. JsonLargeIntegerHandling::kAsNumber opts back into raw numeric output for consumers that preserve full 64-bit integers. Adds JsonTestEnum/JsonTestArrayStruct/JsonTestStruct/JsonEnumStruct/ JsonFloatStruct fixtures to testdata/text_format.emb and coverage in text_format_test.cc and emboss_array_view_test.cc (compact and multiline output, skipped fields, large-integer and unnamed-enum handling, and NaN/Infinity). Regenerates the C++ goldens.
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Add JSON output support to Emboss text format