community: Add SparkLLM to community

[liugddx]

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Checklist:

• PR title: Please title your PR "package: description", where "package" is whichever of langchain, community, core, experimental, etc. is being modified. Use "docs: ..." for purely docs changes, "templates: ..." for template changes, "infra: ..." for CI changes.
  • Example: "community: add foobar LLM"
• [ x] PR message: Delete this entire template message and replace it with the following bulleted list
  • Description: community: Add SparkLLM to community
  • Issue: the issue # it fixes, if applicable
  • Dependencies: No
  • Twitter handle: No
• Pass lint and test: Run make format, make lint and make test from the root of the package(s) you've modified to check that you're passing lint and testing. See contribution guidelines for more information on how to write/run tests, lint, etc: https://python.langchain.com/docs/contributing/
• Add tests and docs: If you're adding a new integration, please include
  1. a test for the integration, preferably unit tests that do not rely on network access,
  2. an example notebook showing its use. It lives in docs/docs/integrations directory.

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Name	Status	Preview	Comments	Updated (UTC)
langchain	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 20, 2024 8:58am

[liugddx]

@baskaryan Please help me review the code, thanks.

[liugddx]

@baskaryan PTAL, thanks.

[liugddx]

@baskaryan Please help me merge this pr.