Allow trailing comma in flow mapping/sequence

fktn-k commented 3 months ago

The current parser didn't allow trailing commas in flow mappings/sequences like the following valid YAML snippet:

foo: {
  null: 123,
  baz: true,
}
bar: [
  3.14,
  false,
]

The YAML spec allows both putting/omitting trailing commas in flow mappings/sequences.
So, this PR has modified the implementation to allow putting trailing commas by modifying state management for flow contexts.

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