martin-cp: better nullness/bbox handling for vastly increased performance

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good first issuehelp wantedmartin-cpperformancerust

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Currently, when martin-cp sees the following, the green area will be attempted to copy.

This is suboptimal, as the green area cannot ever have tiles. We should either

if the query is taking very long (more than 10 minutes, or something) calculate the bboxes for each source and see if we can skip tiles
use the bboxes of sources to pre-filter sources (This might also apply to martin itsself, I have not checked)

The motivation for this is the following observation:

Research direction: Study the martin cp tile copying logic, focusing on how null tiles and bounding boxes (bbox) are processed. Explore ways to filter out tiles that cannot have tiles by using source bboxes, possibly with a timeout for long queries. Look at existing tests and benchmarks to understand performance impact.
Tech stack: rust
Domain: backend
Issue type: Performance
Difficulty: 3
Estimated time: Half day
Activity status: Active
Clarity: Clear
Prerequisites: GitRust
Newbie friendliness: 55