New documentation parser (#5917)

Implement new Enso documentation parser; remove old Scala Enso parser.

Performance: Total time parsing documentation is now ~2ms.

# Important Notes
- Doc parsing is now done only in the frontend.
- Some engine tests had never been switched to the new parser. We should investigate tests that don't pass after the switch: #5894.
- The option to run the old searcher has been removed, as it is obsolete and was already broken before this (see #5909).
- Some interfaces used only by the old searcher have been removed.

CHANGELOG.md

@@ -117,6 +117,8 @@
   open them in the IDE (which is not part of the React app, but can be switched
   to from the dashboard). The PR also adds authentication+authorization (i.e.,
   sign up and sign in for users), via either email/password or GitHub/Google.
+- [New Enso documentation parser][5917]. Smaller and faster; enables planned
+  improvements to internal documentation representation.
 
 #### EnsoGL (rendering engine)
 
@@ -527,6 +529,7 @@
 [5802]: https://github.com/enso-org/enso/pull/5802
 [5850]: https://github.com/enso-org/enso/pull/5850
 [5863]: https://github.com/enso-org/enso/pull/5863
+[5917]: https://github.com/enso-org/enso/pull/5917
 
 #### Enso Compiler
 

Cargo.toml

@@ -18,6 +18,7 @@ members = [
   "build/deprecated/rust-scripts",
   "build/shader-tools",
   "lib/rust/*",
+  "lib/rust/parser/doc-parser",
   "lib/rust/parser/src/syntax/tree/visitor",
   "lib/rust/parser/jni",
   "lib/rust/parser/generate-java",

app/gui/Cargo.toml

@@ -16,6 +16,7 @@ enso-data-structures = { path = "../../lib/rust/data-structures" }
 enso-debug-api = { path = "../../lib/rust/debug-api" }
 enso-debug-scene = { path = "view/examples" }
 enso-frp = { path = "../../lib/rust/frp" }
+enso-doc-parser = { path = "../../lib/rust/parser/doc-parser" }
 enso-prelude = { path = "../../lib/rust/prelude" }
 enso-profiler = { path = "../../lib/rust/profiler" }
 enso-executor = { path = "../../lib/rust/executor" }
@@ -34,7 +35,6 @@ ensogl-drop-manager = { path = "../../lib/rust/ensogl/component/drop-manager" }
 fuzzly = { path = "../../lib/rust/fuzzly" }
 ast = { path = "language/ast/impl" }
 parser = { path = "language/parser" }
-parser-scala = { path = "language/parser-scala" }
 ide-view = { path = "view" }
 engine-protocol = { path = "controller/engine-protocol" }
 json-rpc = { path = "../../lib/rust/json-rpc" }