add weak subjectivity logic

[paologalligit]

Description

This PR introduces an optional flag --wsc-provider-url to allow the client to check against a week subjectivity checkpoint if the local synched chain is the canonical.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• 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
• New and existing E2E tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have not added any vulnerable dependencies to my code

[codecov-commenter]

Codecov Report

❌ Patch coverage is 72.00000% with 21 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
cmd/thor/node/wsc.go	81.25%	6 Missing and 6 partials ⚠️
cmd/thor/node/packer_loop.go	0.00%	5 Missing ⚠️
cmd/thor/main.go	0.00%	2 Missing ⚠️
cmd/thor/node/node.go	50.00%	1 Missing and 1 partial ⚠️

📢 Thoughts on this report? Let us know!

[github-actions]

This pull request has been marked as stale due to inactivity. It will be closed if no further activity occurs. Thank you for your contributions.