Startup checks

[thesimplekid]

Description

This moves start up checks to make ensure that the stat of mint and melt quotes are up to date with the ln backend from within cdk-mint to fns on cdk::MInt.

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Suggested CHANGELOG Updates

ADDED

• cdk(mint): Added Mint::check_pending_mint_quotes
• cdk(mint): Added Mint::check_pending_melt_quotes

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Checklist

• [x] I followed the code style guidelines
• [x] I ran just final-check before committing