Add --session-id to resume command to allow resuming single sessions

[benalleng]

Adds the ability to resume single sessions instead of all sessions at once.

usage --session-id {session_id} to only resume that individual session. will fail if the session is already closed or not existent.

Coded with Deepseek v4

Pull Request Checklist

Please confirm the following before requesting review:

• I have disclosed my use of
  AI
  in the body of this PR.
• I have read CONTRIBUTING.md and rebased my branch to produce hygienic commits.

[coveralls]

Coverage Report for CI Build 28617298532

Coverage decreased (-0.02%) to 85.725%

Details

• Coverage decreased (-0.02%) from the base build.
• Patch coverage: 5 uncovered changes across 3 files (6 of 11 lines covered, 54.55%).
• No coverage regressions found.

Uncovered Changes

File	Changed	Covered	%
payjoin-cli/src/app/v2/mod.rs	3	1	33.33%
payjoin-cli/src/main.rs	6	4	66.67%
payjoin-cli/src/app/v1.rs	1	0	0.0%
Total (4 files)	11	6	54.55%

Coverage Regressions

No coverage regressions found.

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Coverage Stats

Relevant Lines:	15321
Covered Lines:	13134
Line Coverage:	85.73%
Coverage Strength:	355.68 hits per line

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💛 - Coveralls

[spacebear21]

concept ACK and utACK