Add more Spark functions

[shangyian]

Summary

This PR adds the following Spark SQL functions:

• transform_keys
• transform_values
• map_zip_with

It also fixes a few bugs:

• Calling concat on maps is possible
• aggregate's lambda function can take three or four arguments, depending on whether a finish function is provided
• We don't infer types on nested lambda functions correctly, so for the time being we just introduce a workaround with CAST(... AS ...) around the nested lambda, allowing the type to be manually specified by the user

Test Plan

• [ ] PR has an associated issue: #
• [x] make check passes
• [x] make test shows 100% unit test coverage

Deployment Plan

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