feat: upgrade sqlfluff to 3.2.x

[rubytobi]

Closes #644

Since SQLFluff 3.2.0, "the bracketed arguments are now wrapped in a function_contents object". I adjusted the code base so that it works again.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.55%. Comparing base (a3a8ada) to head (41d1a59).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #660   +/-   ##
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  Coverage   99.55%   99.55%           
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  Files          41       41           
  Lines        2224     2229    +5     
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+ Hits         2214     2219    +5     
  Misses         10       10           

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[reata]

Sorry for the delayed response, been struggling in my work for past months.

This PR makes all the sense to me. I made a few edit though:

1. upgrade sqlfluff to 3.3.0, as this is the newest release and I see no new breaking changes.
2. pin the sqlfluff version to 3.3.0, not using tilde equal because we rely on a lot of implementation details in sqlfluff. And based on our past experience, those can change within minor versions. To mitigate, I'll try release sqllineage on a monthly basis this year (if my workload allows for it) so that we can stay up to date with sqlfluff.
3. split a dedicated logic for function type handling to make it a bit more readable.

Thanks for your contribution!