Draft: Add curated ruleset for Rust

What does this MR do?

After enabling support for Rust in the semgrep analyzer, adds a gitlab curated ruleset for the rust language. Based on the OSS semgrep ruleset: https://github.com/semgrep/semgrep-rules/tree/develop/rust/lang/security

What are the relevant issue numbers?

• Support Rust SAST Analyzer (gitlab-org/gitlab#390733 - closed)
• Enable Support for Rust in Semgrep Analyzer (gitlab-org/gitlab#439046 - closed)

Does this MR meet the acceptance criteria?

• The test cases cover both positive and negative cases and are also annotated with appropriate semgrep annotations:
  • For positive cases: // ruleid: ...
  • For negative cases: // ok: ....
• Following metadata fields exist for the rule(s) added/updated in this MR:
  • owasp with both 2017 and 2021 mappings.
  • category: "security"
  • cwe
  • shortDescription
  • security-severity
• The message field is valid and contains a secure code example.
• Applicable license is mentioned in the rule if embedded/taken from external source.
• Relevant labels including workflow labels are appropriately selected.