Bug 1955298 - uniffi-bindgen-gecko-js: start using the IR pipeline, r=markh,frontend-codestyle-reviewers

Updated the uniffi-bindgen-gecko-js code to use two things I've been
experimenting with:

* Use the IR pipeline code to generate the structs used to render the
  templates.
* A new test fixture for bindings generators.  This one targets bindings
  generators specifically, it doesn't try test the scaffolding code and
  it's not based on real-world example code.  I originally thought it
  would be a single crate, but I ended up needed 2 in order to test
  external types. (https://bugzilla.mozilla.org/show_bug.cgi?id=1948961)

Differential Revision: https://phabricator.services.mozilla.com/D242385

Cargo.lock

@@ -2565,7 +2565,6 @@ dependencies = [
  "gecko_logger",
  "geckoservo",
  "gkrust-uniffi-components",
- "gkrust-uniffi-fixtures",
  "gkrust_utils",
  "http_sfv",
  "idna_glue",
@@ -2616,6 +2615,7 @@ dependencies = [
  "unic-langid-ffi",
  "unicode-bidi",
  "unicode-bidi-ffi",
+ "uniffi-bindgen-gecko-js-test-fixtures",
  "url",
  "viaduct",
  "webext-storage",
@@ -2637,24 +2637,6 @@ dependencies = [
  "webext-storage",
 ]
 
-[[package]]
-name = "gkrust-uniffi-fixtures"
-version = "0.1.0"
-dependencies = [
- "uniffi",
- "uniffi-example-arithmetic",
- "uniffi-example-custom-types",
- "uniffi-example-geometry",
- "uniffi-example-rondpoint",
- "uniffi-example-sprites",
- "uniffi-example-todolist",
- "uniffi-fixture-callbacks",
- "uniffi-fixture-external-types",
- "uniffi-fixture-futures",
- "uniffi-fixture-refcounts",
- "uniffi-trait-interfaces",
-]
-
 [[package]]
 name = "gkrust_utils"
 version = "0.1.0"
@@ -6975,101 +6957,21 @@ dependencies = [
  "clap",
  "extend",
  "heck",
+ "indexmap",
  "serde",
  "textwrap",
  "toml",
  "uniffi",
  "uniffi_bindgen",
+ "uniffi_pipeline",
 ]
 
 [[package]]
-name = "uniffi-example-arithmetic"
-version = "0.22.0"
+name = "uniffi-bindgen-gecko-js-test-fixtures"
+version = "0.29.0"
 dependencies = [
- "thiserror 1.999.999",
- "uniffi",
-]
-
-[[package]]
-name = "uniffi-example-custom-types"
-version = "0.19.6"
-dependencies = [
- "anyhow",
- "bytes",
- "serde_json",
- "uniffi",
- "url",
-]
-
-[[package]]
-name = "uniffi-example-geometry"
-version = "0.22.0"
-dependencies = [
- "uniffi",
-]
-
-[[package]]
-name = "uniffi-example-rondpoint"
-version = "0.22.0"
-dependencies = [
- "uniffi",
-]
-
-[[package]]
-name = "uniffi-example-sprites"
-version = "0.22.0"
-dependencies = [
- "uniffi",
-]
-
-[[package]]
-name = "uniffi-example-todolist"
-version = "0.22.0"
-dependencies = [
- "once_cell",
- "thiserror 1.999.999",
- "uniffi",
-]
-
-[[package]]
-name = "uniffi-fixture-callbacks"
-version = "0.21.0"
-dependencies = [
- "thiserror 1.999.999",
- "uniffi",
-]
-
-[[package]]
-name = "uniffi-fixture-external-types"
-version = "0.21.0"
-dependencies = [
- "thiserror 1.999.999",
- "uniffi",
- "uniffi-example-geometry",
- "uniffi-example-sprites",
-]
-
-[[package]]
-name = "uniffi-fixture-futures"
-version = "0.21.0"
-dependencies = [
- "log",
- "moz_task",
- "uniffi",
-]
-
-[[package]]
-name = "uniffi-fixture-refcounts"
-version = "0.21.0"
-dependencies = [
- "uniffi",
-]
-
-[[package]]
-name = "uniffi-trait-interfaces"
-version = "0.22.0"
-dependencies = [
- "uniffi",
+ "uniffi_bindings_tests",
+ "uniffi_bindings_tests_external_types",
 ]
 
 [[package]]
@@ -7099,6 +7001,23 @@ dependencies = [
  "uniffi_udl",
 ]
 
+[[package]]
+name = "uniffi_bindings_tests"
+version = "0.29.0"
+dependencies = [
+ "thiserror 1.999.999",
+ "uniffi",
+]
+
+[[package]]
+name = "uniffi_bindings_tests_external_types"
+version = "0.29.0"
+dependencies = [
+ "thiserror 1.999.999",
+ "uniffi",
+ "uniffi_bindings_tests",
+]
+
 [[package]]
 name = "uniffi_build"
 version = "0.29.2"