dialects: (stablehlo) add more operations

[efferifick]

This PR adds the following operations:

• atan2
• cbrt
• ceil

And the attributes:

• comparison_direction
• comparison_type

[codecov]

Codecov Report

Attention: Patch coverage is 83.92857% with 9 lines in your changes missing coverage. Please review.

Project coverage is 89.04%. Comparing base (d061a40) to head (cadf2fb).

Files with missing lines	Patch %	Lines
xdsl/dialects/stablehlo.py	83.92%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4090      +/-   ##
==========================================
- Coverage   89.05%   89.04%   -0.01%     
==========================================
  Files         319      319              
  Lines       43413    43469      +56     
  Branches     5402     5405       +3     
==========================================
+ Hits        38660    38707      +47     
- Misses       3409     3418       +9     
  Partials     1344     1344              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[compor]

Suggested change

	https://github.com/openxla/stablehlo/blob/main/docs/spec.md#compare
	See [StableHLO Specification](https://github.com/openxla/stablehlo/blob/main/docs/spec.md#compare)

Nit, but helps with working URLs when publishing our documentation.
Similarly below.

[efferifick]

Thank you! 174982d

[compor]

Mind adding the external spec doc link to this and ceil below as well please?

[efferifick]

Thank you! 174982d

[superlopuh]

Oh I forgot about docs, but it's a good point, could you please do a pass over the dialect file to make the doc page look nice?

https://xdsl--4090.org.readthedocs.build/en/4090/reference/dialects/stablehlo/index.html#xdsl.dialects.stablehlo.ComparisonDirectionAttr

Probably worth doing in a separate PR IMO. You can launch the website locally with make docs-serve, should make it easier to iterate.

[efferifick]

@compor @superlopuh , I will go and make the documentation look good after PR #4092 goes through, sounds good?

[efferifick]

@compor, I don't have merge privileges, hehe :) can you please merge? Thanks!