ApiClient: support deserializing from InputStream instead of String to bypass 2GB Java String limit

[klin1344]

Fixes issue #4020 .

Makes two changes:

1. In ApiClient, if we are deserializing JSON, get the response body as an InputStream instead of String for deserialization.
2. Adds a new deserialize() method in JSON.java which accepts InputStream.

These two changes enable the ApiClient to bypass the 2GB String length limit in Java and deserialize large responses greater than 2GB into Java objects.

[linux-foundation-easycla]

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• ✅ login: klin1344 / name: Kevin Lin (e7e0548)

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[brendandburns]

Thanks for the PR. This code is generated. You need to make the changes here:

https://github.com/OpenAPITools/openapi-generator/blob/master/modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson/ApiClient.mustache

And then we will get the update next time that we regenerate the code.

[klin1344]

Fixes issue #4020 .

Makes two changes:

1. In ApiClient, if we are deserializing JSON, get the response body as an InputStream instead of String for deserialization.
2. Adds a new deserialize() method in JSON.java which accepts InputStream.

These two changes enable the ApiClient to bypass the 2GB String length limit in Java and deserialize large responses greater than 2GB into Java objects.

Ah I see, thank you! Opened this PR for the openapi-generator repo and will close this one.