ci: add SARIF filtering for circomspect ignore rules

[0x471]

Description

This PR adds the ability to suppress specific circomspect warnings in CI by filtering SARIF output

Changes

• Added .circomspectignore.yaml file for defining rules to suppress
• Implementedscripts/filter-sarif.ts that reads circomspect SARIF output and filters out entries matching ignore rules
• Updated .github/workflows/main.yml to use filtered SARIF
• Added yarn lint:sarif command for local testing

Example .circomspectignore.yaml

# Example:
   ignore:
     - rule: CS0010
       files:
         - packages/utils/src/float.circom
         - packages/utils/src/safe-comparators.circom:17

Related Issue(s)

Closes #12

Checklist

• I have read and understand the contributor guidelines and code of conduct.
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have run yarn style without getting any errors
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes