Add recorded usages URI to API

[mosuem]

Add an API to retrieve the serialized recorded usages file. Keeping this as a URI decouples it from package:record_use, allowing us to evolve that package without needing to update native_assets_cli.

cc @mkustermann @dcharkes

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[github-actions]

PR Health

Breaking changes ✔️

Package	Change	Current Version	New Version	Needed Version	Looking good?
native_assets_cli	Breaking	0.7.4-wip	0.8.0-wip	0.8.0-wip	✔️

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pkgs/ffigen/example/shared_bindings/generate.dart
pkgs/ffigen/example/shared_bindings/lib/generated/a_gen.dart
pkgs/ffigen/example/shared_bindings/lib/generated/a_shared_b_gen.dart
pkgs/ffigen/example/shared_bindings/lib/generated/base_gen.dart
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pkgs/jni/lib/src/third_party/jni_bindings_generated.dart
pkgs/jnigen/android_test_runner/lib/main.dart
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Package publish validation ✔️

Package	Version	Status
package:ffi	2.1.3	already published at pub.dev
package:ffigen	14.0.0-wip	WIP (no publish necessary)
package:jni	0.11.0	already published at pub.dev
package:jnigen	0.11.0	already published at pub.dev
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package:objective_c	2.0.0-wip	WIP (no publish necessary)
package:swift2objc	0.0.1-wip	WIP (no publish necessary)
package:swiftgen	0.0.1-wip	WIP (no publish necessary)

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[coveralls]

coverage: 78.4%. remained the same
when pulling 9a30d01 on exposeRecordUseInLink
into 68b2e24 on main.