[java] Add config option to print 64-bit integers in JSON as unquoted ints if they can be losslessly converted into a 64-bit float

[mlmitch]

The title of this issue is taken from the following commit made in March 2023.
330e10d

That commit added a configuration option to the C++ JSON printer for printing 64-bit integers in JSON as unquoted ints if they can be losslessly converted into a 64-bit float. This issue is a request for a similar configuration option to be added to the Java JSON printer.

What language does this apply to?
This applies to the JSON printing functionality in the util libraries.
I am primarily concerned with Java.

Describe the problem you are trying to solve.
I have a need to export protobuf integers in the range of (2^32, 2^53) as JSON numbers instead of as decimal strings.
I want to be able to do this without sacrificing the benefits of using an integer type in my protobuf definitions.

Describe the solution you'd like
The solution in the linked commit seems great to me and its functionality already in the protobuf codebase.
Similar functionality in Java and other languages seems most appropriate.

Describe alternatives you've considered
Other solutions are talked about in the linked issues below. None of them resulted in an implementation.

Additional context

Something like this has been in high demand from the community for a while. Some previous issues around this topic:

• JsonFormat: why is Int64 being converted to a string ? #1823
• Why uint64, int64 Protobuf-Type be serialize as String JSON-Type in MessageToJsonString()? #2679
• protojson: Add MarshalOption to write int64 as a number and not as a string golang/protobuf#1414
• JsonFormat int64 converting #3194
• ProtoToJsonString : int64 is converted to string even when jstype=JSON_NUMBER #3423
• MessageToJson outputs the wrong type for uint64 and int64 in Python #2954
• The format is wrong when output int_64 to JSON.. #4103
• json_format.py is converting fixed64 to string #5942

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