feat: add sync with coverage tool

[souradeep-das]

What was wrong?

Related to Issue #1112

How was it fixed?

Added a script that runs live coverage of execution-specs while syncing mainnet blocks, and finds out blocks that hit code paths not covered by the baseline (json_infra tests).

This script:

1. Generates a Baseline coverage by running json_infra tests if coverage.xml doesn't exist
2. Converts coverage.xml to baseline_coverage.json if needed
3. Runs slipcover along with the sync tool

Note:
To be able to pause/run from a midpoint, persist needs to work (on the sync tool). If state is persisted as a part of the sync tool, the syncing (and coverage) continues from that the last persisted state. This PR does not fix persist

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