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### Context: DDC modules are abstractions over how libraries are loaded/updated. The entirety of google3 uses the DDC/legacy module system due to its flexibility extensibility over the other two (ES6 and AMD/RequireJS). Unifying DDC's module system saves us from duplicating work and will allow us to have finer grained control over how JS modules are loaded. This is a a prerequisite to features such as hot reload. ### Overview: This change plumbs a boolean flag through flutter_tools that switches between DDC (new) and AMD (current) modules. This mode is automatically applied when `--extra-front-end-options=--dartdevc-module-format=ddc` is specified alongside `flutter run`. Other important additions include: * Splitting Flutter artifacts between DDC and AMD modules * Adding unit tests for the DDC module system * Additional bootstrapper logic for the DDC module system We don't expect to see any user-visible behavior or performance differences. This is dependent on [incoming module system support in DWDS](https://github.com/dart-lang/webdev/pull/2295) and [additional artifacts in the engine](https://github.com/flutter/engine/pull/47783). This is part of a greater effort to deprecate the AMD module system: https://github.com/dart-lang/sdk/issues/52361 |
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