OCR2VRF Coordinator Optimizations

[vreff]

This PR adds the following to the coordinator:

• Adds a block cache that can store items such as blocks and callbacks with a time-based eviction window.
• Uses the block cache to filter blocks and callbacks.
• No longer stores a block as in-flight if the VRF proof is 0.
• Adds batching (max 5,000,000 gas per batch as a default).
• Adds logic for adding blocks and callbacks to a batch.

[github-actions[bot]]

I see that you haven't updated any CHANGELOG files. Would it make sense to do so?

[github-actions[bot]]

Solana Smoke Test Results

1 tests   1 :heavy_check_mark:  4m 42s :stopwatch: 1 suites  0 :zzz: 1 files    0 :x:

Results for commit 10dcc812.

:recycle: This comment has been updated with latest results.

[github-actions[bot]]

EVM Smoke Test Results

61 tests   31 :heavy_check_mark:  6m 32s :stopwatch:   1 suites  30 :zzz:   1 files      0 :x:

Results for commit 10dcc812.

:recycle: This comment has been updated with latest results.