Treatment optimization

[petrasovaa]

Initial draft of optimization. Features:

• an ABC particle is a combination of infected pixels
• supports buffers around infected pixels, potentially with variable buffer size
• treatments have cost, so the treatment size is limited by the budget (input)
• metric is either infected area or distance to quarantine boundary (or both in some ratio)

Missing documentation, tests. Computed best estimate used for initial weights makes sense only when using infected area as a metric. Could be implemented for arbitrary patches, not only for pixels.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 435 lines in your changes are missing coverage. Please review.

Project coverage is 78.70%. Comparing base (ac1383a) to head (ce95a0c). Report is 8 commits behind head on main.

:exclamation: Current head ce95a0c differs from pull request most recent head 7e886ff. Consider uploading reports for the commit 7e886ff to get more accurate results

Files	Patch %	Lines
R/optimize.R	0.00%	435 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #164 +/- ## ========================================== - Coverage 83.77% 78.70% -5.08% ========================================== Files 59 47 -12 Lines 6066 5831 -235 ========================================== - Hits 5082 4589 -493 - Misses 984 1242 +258 ```

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