feat: Support persisting SQLite DB, and data refresher

[lukehesluke]

This PR builds on top of the changes from this PR: #156. The main difference is this:

• It is less ambitious. Rather than supporting SQL Server, for external persistent storage, it just uses SQLite. The storage persists by simply re-using the same file

I did not quite have time to set up CI tests for this (though this has been partially complete). So, that has been put into another (wip) PR: #237

Possible goals for a later date, which are not being pursued here (they would need sufficient usecase (e.g. use at scale) to be worth pursuing in a future issue):

• Support SQL Server (or PostgreSQL / MySQL / etc). This would be more reliable and scalable
• Support SQL migrations, so that schema changes can be made without needing to clear an existing database

QA

Using the CI script from #237:

➜  OpenActive.Server.NET git:(feature/persistent-db-ci) ✗ node scripts/testPersistentDatabase.js 
Starting test process...
1a). Please spawn a RefImpl process in the background with the specified env vars. Type "y" when done: y
Continuing with RefImpl running...
(node:55518) Warning: Setting the NODE_TLS_REJECT_UNAUTHORIZED environment variable to '0' makes TLS connections and HTTPS requests insecure by disabling certificate verification.
(Use `node --trace-warnings ...` to show where the warning was created)
Put old opportunity into ref impl db: 200 {
  '@context': 'https://openactive.io/',
  '@type': 'ScheduledSession',
  '@id': 'https://localhost:5001/api/identifiers/scheduled-sessions/1/events/1'
}
1c). Please spawn a Broker process in the background with the specified env vars. Type "y" when done: y
Continuing with Broker running...
Awaiting Broker health check...
Broker health check passed
✅ Confirmed that past-bookable opportunity was found in broker feed
✅ Asserted that there is no bookable opportunity in broker feed
Please kill the Broker and RefImpl processes. Type "y" when done: y
Continuing after killing processes...
2a). Please spawn a RefImpl process with data refresher enabled. Type "y" when done: y
Continuing with RefImpl and data refresher running...
Data refresher has completed its first cycle
2c). Please spawn a Broker process (same as in step 1c). Type "y" when done: y
Continuing with Broker running...
Awaiting Broker health check...
Broker health check passed
✅ Asserted that there is a bookable opportunity in broker feed
2e). Please kill all processes and prepare to exit. Type "y" when done: y
Test completed successfully!
➜  OpenActive.Server.NET git:(feature/persistent-db-ci) ✗ 

[lukehesluke]

I think this had accidentally entered the git repo at some point

[lukehesluke]

This file is very similar to FakeDataRefresherService from #156, except with the following changes:

• Logs
• It informs DataRefresherStatusService when a has completed a cycle (which is explained in that file)

[civsiv]

Suggested change

	private static readonly Type[] TableTypesToDrop = new []
	// This is TableTypesToCreate in reverse order
	private static readonly Type[] TableTypesToDrop = new []

[civsiv]

I spent 30s wondering what was different between the two despite the comment below as I saw this first