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/Cargo.toml

@@ -14,3 +14,4 @@ scale-info = { version = "2.5.0", features = ["bit-vec"] }
 frame-metadata = "15.0.0"
 codec = { package = "parity-scale-codec", version = "3.0.0", default-features = false, features = ["derive", "full", "bit-vec"] }
 subxt = { path = "../../subxt" }
+subxt-metadata = { path = "../../metadata" }