feat(fronted): cotd implementation

[CAJan93]

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What's changed and what's your intention?

Implement the COTD function. This implementation is slightly different from the PSQL implementation. I do not return an error on COTD(Inf), but instead return NaN.

• Tracking Issue
• PSQL implementation

Checklist For Contributors

• I have written necessary rustdoc comments
• I have added necessary unit tests and integration tests
• I have added fuzzing tests or opened an issue to track them. (Optional, recommended for new SQL features Sqlsmith: Sql feature generation #7934).
• I have demonstrated that backward compatibility is not broken by breaking changes and created issues to track deprecated features to be removed in the future. (Please refer to the issue)
• All checks passed in ./risedev check (or alias, ./risedev c)

Checklist For Reviewers

• I have requested macro/micro-benchmarks as this PR can affect performance substantially, and the results are shown.

Documentation

• My PR DOES NOT contain user-facing changes.

Click here for Documentation

Types of user-facing changes

Please keep the types that apply to your changes, and remove the others.

• Installation and deployment
• Connector (sources & sinks)
• SQL commands, functions, and operators
• RisingWave cluster configuration changes
• Other (please specify in the release note below)

Release note

COTD: An implementation of the cotangent in degrees.

[CAJan93]

renamed these to make sure that we are talking about degrees and not radians

[codecov]

Codecov Report

Merging #9259 (dab8a39) into main (a504f0e) will increase coverage by 0.00%.
The diff coverage is 98.14%.

@@           Coverage Diff           @@
##             main    #9259   +/-   ##
=======================================
  Coverage   70.81%   70.81%           
=======================================
  Files        1228     1228           
  Lines      203786   203838   +52     
=======================================
+ Hits       144304   144349   +45     
- Misses      59482    59489    +7     

Flag	Coverage Δ
rust	70.81% <98.14%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/frontend/src/expr/pure.rs	94.73% <ø> (ø)
src/expr/src/vector_op/trigonometric.rs	97.48% <98.11%> (+1.39%)	⬆️
src/frontend/src/binder/expr/function.rs	89.63% <100.00%> (+0.01%)	⬆️

... and 6 files with indirect coverage changes

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[lmatz]

LGTM