[record_use] Implementation: dart2js: Stop using `package:record_use` in compiler internals

[dcharkes]

dart2js needs to serialize and deserialize all its logic internally, and needs to do so in an incremental / separate compilation manner.

package:record_use is a format meant to be used for when all information is known and meant to be used as a whole, not in parts (don't serialize a single const that has a index to another const in some index).

So, we'll need to refactor the dart2js implementation to only convert to record_use types before writing the file instead of in the internals.

Context:

• [record_use] Completeness: dart2js: const map and list arguments #2896