feat(subflows): added the parallel and loop block

[aadamgough]

Description

Added the parallel execution and the loop blocks.

Type of change

• [x] New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Verified that the functionality of the reactflow node acts as it is supposed to with adding child blocks, removing child blocks, adding edges, removing edges, and expanding the node itself.

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] All tests pass locally and in CI (bun run test)
• [x] My changes generate no new warnings
• [x] Any dependent changes have been merged and published in downstream modules
• [x] I have updated version numbers as needed (if needed)
• [x] I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

Security Considerations:

• [x] My changes do not introduce any new security vulnerabilities
• [x] I have considered the security implications of my changes

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[aadamgough]

Greptile changes have been added. Ready for review.