Concurrency updates and database logging APIs

[gwynne]

These changes are now available in 4.11.0

This update contains the following changes:

• Two new APIs are available: Application.db(_:logger:) and Request.db(_:logger:). These work exactly the way the respective .db(_:) methods do, except the database's logger will be set to the one provided rather than the default. These APIs will hopefully make it easier to work around the unfortunate fact that Database.logging(to:) and its SQLKit counterpart basically don't work at all.
• The --auto-migrate and --auto-revert commandline flags no longer call EventLoopFuture.wait() when the app is booted in async mode (no more crash risk).
• The migrate command now has nicer console output.
• All tests have been updated to be fully async.

[codecov]

Codecov Report

Attention: Patch coverage is 65.78947% with 13 lines in your changes are missing coverage. Please review.

Project coverage is 60.75%. Comparing base (d831ac5) to head (d3579e2).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #775      +/-   ##
==========================================
+ Coverage   59.84%   60.75%   +0.91%     
==========================================
  Files          15       15              
  Lines         381      372       -9     
==========================================
- Hits          228      226       -2     
+ Misses        153      146       -7     

Files	Coverage Δ
Sources/Fluent/MigrateCommand.swift	8.33% <0.00%> (+1.51%)	⬆️
Sources/Fluent/FluentProvider.swift	71.08% <78.12%> (-7.49%)	⬇️

... and 3 files with indirect coverage changes

[0xTim]

LGTM