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chore(json_edit): Add lossless JSON/JSON5 editor (#504)

Introduces a new contrib crate, `json_edit`, which parses JSON and JSON5
into a lossless syntax tree (powered by `rowan`) and exposes high-level
editing operations that leave untouched content intact: comments,
whitespace, key ordering, and quote styles are all preserved for
anything that wasn't explicitly changed.

The crate provides a `Document` type for parsing, an `Object` type for
reading and mutating key-value pairs via `get`, `set`, and `remove`, and
a top-level `deep_merge` function for recursively merging a
`serde_json::Value` into an existing document without reformatting it.

Both strict JSON and the JSON5 superset (unquoted keys, single-quoted
strings, line/block comments, trailing commas) are supported via a
`Dialect` enum.

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Signed-off-by: Jean Mertz <git@jeanmertz.com>

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