Add SendableRoute type

[0xTim]

Adds a new SendableRoute to replace Route. This is designed to be a value type from the ground up which removes the need to access properties via locks in a large number of places.

Most users should be switched over automatically.

[codecov-commenter]

Codecov Report

Merging #3100 (7f39b27) into main (d682e05) will decrease coverage by 1.61%.
Report is 2 commits behind head on main.
The diff coverage is 52.87%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3100      +/-   ##
==========================================
- Coverage   76.27%   74.66%   -1.61%     
==========================================
  Files         211      212       +1     
  Lines        8011     8178     +167     
==========================================
- Hits         6110     6106       -4     
- Misses       1901     2072     +171     

Files	Coverage Δ
Sources/Vapor/Responder/DefaultResponder.swift	99.15% <100.00%> (ø)
...urces/Vapor/Routing/RoutesBuilder+Middleware.swift	60.00% <100.00%> (-8.75%)	⬇️
Sources/Vapor/Commands/RoutesCommand.swift	1.53% <0.00%> (ø)
...rces/Vapor/Concurrency/WebSocket+Concurrency.swift	82.25% <71.42%> (-10.47%)	⬇️
Sources/Vapor/Routing/RoutesBuilder.swift	0.00% <0.00%> (ø)
...ources/Vapor/Routing/RoutesBuilder+WebSocket.swift	47.36% <82.35%> (-38.35%)	⬇️
Sources/Vapor/Routing/RoutesBuilder+Group.swift	38.88% <0.00%> (-11.12%)	⬇️
Sources/Vapor/Request/Request.swift	75.51% <0.00%> (-4.35%)	⬇️
Sources/Vapor/Routing/Routes.swift	54.28% <25.00%> (-24.89%)	⬇️
Sources/Vapor/Routing/Route.swift	0.00% <0.00%> (-52.50%)	⬇️
... and 3 more

... and 2 files with indirect coverage changes