Add batch support to lua module

[chipsenkbeil]

While the module supports individual commands, we have not provided support for batching commands, which could be crucial to performance improvements. Batching is not exposed in SessionChannelExt, so we need to think through how to offer this in a way that is clean.

Current approach I can think of is to have a batch function that takes 1 or more RequestData and returns them, but this wouldn't be any better than using the session directly.

[chipsenkbeil]

It may just be easiest to have the lua module expose a batch async function that takes a list of method names and args and use that to recreate the request data, send a batch request using the session directly, and then map the responses back.

[chipsenkbeil]

No longer supporting lua library, but the cli now supports JSON batch.

[github-actions]

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