Metadata: Retain a subset of metadata pallets (#879)

* Update cargo.lock to use scale-info v2.4.0

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* metadata: Retain only a subset of the metadata

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* codegen: Generate top level Event

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* metadata: Only retain DispatchError

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* metadata: Export just the retain method

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* cli: Retain pallets

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* metadata: Do not include extrinsic metadata

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* retain: Fix clippy

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* test-runtime: Generate per pallet metadata and rs file

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* ui-tests: Check per metadata generated files

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* Revert "test-runtime: Generate per pallet metadata and rs file"

This reverts commit 725a2e5f8339a795892dbbd2df19e49330ae3a9b.

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* ui-tests: Adjust path to metadata file

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* ui-tests: Change drop order to keep `PalletMetadata` around

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* Update metadata/src/retain.rs

Co-authored-by: James Wilson <james@jsdw.me>

* Address feedback

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* retain: Keep extrinsic type

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* cli: Introduce `MetadataSource`

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* cli: Use `MetadataSource` helper

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* cli: Use `FileOrUrl` flatten command argument

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* retain: Do not include generic type params in retained metadata

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* Adjust subxt to scale-info v2.5.0

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* Update scaleinfo to v2.5.0

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* Remove deprecated fn

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* testing: Fix clippy

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* benches: Use inner fields of scale info

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>

* address nits, and strip RuntimeCall type instead of trying to filter out use of it for better overall wins/clarity

* fix UI test

* move utils out of commands folder and fix clippy etc

* address nits

---------

Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>
Co-authored-by: James Wilson <james@jsdw.me>

testing/ui-tests/src/lib.rs

@@ -15,7 +15,7 @@ mod dispatch_errors;
 mod storage;
 mod utils;
 
-use crate::utils::MetadataTestRunner;
+use crate::utils::{MetadataTestRunner, PalletMetadataTestRunner};
 
 // Each of these tests leads to some rust code being compiled and
 // executed to test that compilation is successful (or errors in the
@@ -23,6 +23,7 @@ use crate::utils::MetadataTestRunner;
 #[test]
 fn ui_tests() {
     let mut m = MetadataTestRunner::default();
+    let mut p = PalletMetadataTestRunner::new();
     let t = trybuild::TestCases::new();
 
     t.pass("src/correct/*.rs");
@@ -46,6 +47,11 @@ fn ui_tests() {
         "array_dispatch_error",
         dispatch_errors::metadata_array_dispatch_error(),
     ));
+
+    // Ensure the generate per pallet metadata compiles.
+    while let Some(path) = p.path_to_next_ui_test() {
+        t.pass(path);
+    }
 }
 
 #[test]