Add REST endpoint /clear_packets to trigger packet clearing

[romac]

Closes: #3398

Description

Add a /clear_packets?chain=CHAIN_ID endpoint to the built-in REST server to trigger packet clear for the chain specified in the chain query param or for all chains if the query param is omitted.

---

PR author checklist:

• Added changelog entry, using unclog.
• Added tests: integration (for Hermes) or unit/mock tests (for modules).
• Linked to GitHub issue.
• Updated code comments and documentation (e.g., docs/).
• Tagged one reviewer who will be the one responsible for shepherding this PR.

Reviewer checklist:

• Reviewed Files changed in the GitHub PR explorer.
• Manually tested (in case integration/unit/mock tests are absent).

[puneet2019]

hey @romac , is there any way, and can it be added?
/clear-packets/{channel-id}/{sequence_number} - to clear a single specific packet.
Rest and CLI both.

[romac]

@puneet2019 Tracked here: #3672

Unfortunately I can't promise a timeline for when we can get to it as we have very limit d bandwidth until next year.

[taitruong]

Hi, I've been testing this on 1.7.0 - but seems not to be released yet? Tried these:

http://localhost:3000/clear_packets?chain_id=pisco-1
http://localhost:3000/clear_packets?chain=pisco-1

None works - endpoint seems not to be avaiable. http://localhost:3000/state works though

[taitruong]

just tested with 1.7.1
http://localhost:3001/clear_packets returns 404