fix: prevent recursion error with pallet_collective metadata

[AlexD10S]

Context
pop-cli does not support extrinsics that take another call as a parameter (e.g Utility.batch). Instead, when parsing the chain metadata, it returns a FunctionNotSupported error for such extrinsics and notifies the user that the function is not supported:

 Select the function to call:
│  ○ as_derivative 
│  ● batch (Function Not Supported)

Bug
A bug was discovered when testing the Pop Network mainnet runtime (r0gue-io/pop-node#448), where metadata retrieval for the Council pallet (pallet_collective) caused a recursion error.

The problem is because pallet_collective defines type Proposal = RuntimeCall; (see) rather than referencing RuntimeCall directly, as other pallets do (see).

To Replicate:

pop up parachain -f ./networks/mainnet.toml
pop call chain --url ws://localhost:9944/ 

It also can be tested in a live network (Mythos), that has a council governance.

pop call chain --url wss://mythos.ibp.network

Fix
A new check has been included when parsing metadata to properly identify RuntimeCall at any level within the namespace path. Instead of assuming a direct reference, the system now inspects all segments of the path to detect and handle RuntimeCall correctly (link from scale-info library).

Note
I've created a unit test for this issue using a live chain with the same implementation as the Pop Network mainnet. A TODO comment is included to update the test once the Pop Network goes live.

[sc-2948]

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 75.18%. Comparing base (00680f8) to head (0774706).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/pop-parachains/src/call/metadata/params.rs	87.50%	0 Missing and 2 partials ⚠️

@@            Coverage Diff             @@
##             main     #412      +/-   ##
==========================================
+ Coverage   75.16%   75.18%   +0.02%     
==========================================
  Files          63       63              
  Lines       13870    13886      +16     
  Branches    13870    13886      +16     
==========================================
+ Hits        10425    10440      +15     
+ Misses       2118     2117       -1     
- Partials     1327     1329       +2     

Files with missing lines	Coverage Δ
crates/pop-parachains/src/call/metadata/params.rs	91.66% <87.50%> (-0.38%)	⬇️

... and 1 file with indirect coverage changes

[al3mart]

Nice! Super quick action 👍

It feels that we are being forced to work a bit ad-hoc around these cases we are hitting.