Enhancement: json_name defined in a proto file should be able to be extracted.

[Yo-mah-Ya]

I'm wondering if we could support to get only interface declaration with json_name defined in a proto file, in other words when onlyTypes=true are set, wanna get fields from json_name defined in a proto file.

For example, I want the json_name named Alias shown below proto file. The first letter should be capitalized !
https://github.com/pganalyze/libpg_query/blob/009f19d7f867a699e1beab5fd545fbc07ad35647/protobuf/pg_query.proto#L19

But as long as I see the below part, it seems that only field name, possibly modified by maybeSnakeToCamel though, is supported.

ts-proto/src/main.ts

Lines 877 to 880 in 1283602

	const name = maybeSnakeToCamel(fieldDesc.name, options);
	const isOptional = isOptionalProperty(fieldDesc, messageDesc.options, options);
	const type = toTypeName(ctx, messageDesc, fieldDesc, isOptional);
	chunks.push(code`${maybeReadonly(options)}${name}${isOptional ? "?" : ""}: ${type}, `);

Ideally I'd like to get field name like shown below.
https://github.com/thesayyn/protoc-gen-ts/blob/a5c306a0d1d864ce5bc1887dfef078d76c0efcc0/src/descriptor.ts#L15-L20

[stephenh]

Fixed in #943 , thanks @Yo-mah-Ya !