feat(system): graceful shutdown

[karlprieb]

Implement stop methods to clear queues and stop workers in the following components:

• standalone-sqlite
• ans-104 lib
• ans104-data-indexer
• ans104-unbundler
• bundle-data-importer
• bundle-repair-worker
• data-item-indexer
• transaction-fetcher
• transaction-importer
• transaction-offset-importer
• transaction-offset-repair-worker
• transaction-repair-worker
• webhook-emitter

Through a shutdown function it will close express server and wait for all these componenets/workers to stop.

[codecov[bot]]

Codecov Report

Attention: 25 lines in your changes are missing coverage. Please review.

Comparison is base (c6c48f5) 58.85% compared to head (9dd100c) 58.67%.

Files	Patch %	Lines
src/lib/ans-104.ts	12.50%	14 Missing :warning:
src/workers/ans104-unbundler.ts	25.00%	6 Missing :warning:
src/workers/bundle-data-importer.ts	28.57%	5 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #86 +/- ## =========================================== - Coverage 58.85% 58.67% -0.19% =========================================== Files 21 21 Lines 5982 6023 +41 Branches 285 286 +1 =========================================== + Hits 3521 3534 +13 - Misses 2457 2485 +28 Partials 4 4 ```

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