Enable webdev flags in Jaspr

[Markzipan]

jaspr serve --module-format=ddc enables the new DDC module system, while jaspr serve --web-hot-reload enables DDC hot reload (which uses the backend frontend server implementation).

This is for test purposes as I iterate on some ongoing issues.

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[schultek]

@Markzipan is there a specific setup (dart sdk / build_web_compilers version) required to test this?

When I try to run this I only get a bunch of AssetNotFoundExceptions from build_web_compilers:ddc.

[schultek]

Looks like this fails because the web/main.client.dart entrypoint somehow can't be found during the DdcFrontendServerBuilder:

BUILDER] [WARNING] build_web_compilers:ddc (lazy) on jaspr_riverpod|lib/src/builders.ddc.module:
[BUILDER] [WARNING] AssetNotFoundException: package_riverpod|web/main.client.dart
[BUILDER] [WARNING] build_web_compilers:ddc (lazy) on jaspr_riverpod|lib/src/builders.ddc.module:
[BUILDER] [WARNING] #0      SingleStepReaderWriter.digest (package:build_runner/src/build/single_step_reader_writer.dart:231:7)
[BUILDER] [WARNING] <asynchronous suspension>
[BUILDER] [WARNING] #1      ScratchSpace.ensureAssets.<anonymous closure> (package:scratch_space/src/scratch_space.dart:119:26)
[BUILDER] [WARNING] <asynchronous suspension>
[BUILDER] [WARNING] #2      Future.wait.<anonymous closure> (dart:async/future.dart:546:21)
[BUILDER] [WARNING] <asynchronous suspension>
[BUILDER] [WARNING] #3      DdcFrontendServerBuilder._compile (package:build_web_compilers/src/ddc_frontend_server_builder.dart:77:5)
[BUILDER] [WARNING] <asynchronous suspension>
[BUILDER] [WARNING] #4      DdcFrontendServerBuilder.build (package:build_web_compilers/src/ddc_frontend_server_builder.dart:43:7)
[BUILDER] [WARNING] <asynchronous suspension>
[BUILDER] [WARNING] #5      runBuilder.buildForInput (package:build_runner/src/build/run_builder.dart:85:7)
[BUILDER] [WARNING] <asynchronous suspension>
[BUILDER] [WARNING] #6      Future.wait.<anonymous closure> (dart:async/future.dart:546:21)
[BUILDER] [WARNING] <asynchronous suspension>
[BUILDER] [WARNING] #7      BuildLogLogger.scopeLogAsync.<anonymous closure> (package:build_runner/src/logging/build_log_logger.dart:58:13)

This file is generated by an earlier jaspr builder. Will try to dig deeper

[Markzipan]

There's still some quirks I'm hammering out with the hot reload implementation. I'm going to send out a series of changes that should fix them very soon - though I'll need a new DWDS and webdev release before it's all hooked up. I'll try to debug some jaspr apps with hot reload in my local setup though - it's possible I've missed adding something to this PR.