feat: Web SDK update for version 21.0.0

[ChiragAgg5k]

This PR contains updates to the Web SDK for version 21.0.0.

[coderabbitai]

Walkthrough

The PR updates version references from 20.1.0 to 21.0.0 in README.md (CDN URL), package.json (version), and src/client.ts (x-sdk-version header). It adds two new exported enums: ExecutionStatus (waiting, processing, completed, failed) and ExecutionTrigger (http, schedule, event). src/models.ts now imports these enums and changes the Execution type’s trigger and status fields from string to ExecutionTrigger and ExecutionStatus, respectively. No other logic or API signatures are modified.

Possibly related PRs

• Add time between queries #136: Also updates SDK versioning and x-sdk-version header in client code, overlapping with this PR’s version and header changes.

Suggested reviewers

• loks0n

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changes. Docstring coverage check skipped.
Description Check	✅ Passed	Check skipped - CodeRabbit's high-level summary is enabled.
Title Check	✅ Passed	The title clearly and concisely indicates the primary change of this pull request—bumping the Web SDK to version 21.0.0—without extraneous details, and it matches the updated version in the code.

✨ Finishing touches

• 📝 Generate Docstrings

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch dev

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