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title: Removes `as [disambiguation_path]` from the required syntax in `derive_impl`

doc:
  - audience: Runtime Dev
    description: |
      This PR removes the need to specify `as [disambiguation_path]` for cases where the trait 
      definition resides within the same scope as default impl path. 

      For example, in the following macro invocation
      ```rust
      #[derive_impl(frame_system::config_preludes::TestDefaultConfig as frame_system::DefaultConfig)]
      impl frame_system::Config for Runtime {
        ...
      }
      ```
      the trait `DefaultConfig` lies within the `frame_system` scope and `TestDefaultConfig` impls
      the `DefaultConfig` trait. 
      
      Using this information, we can compute the disambiguation path internally, thus removing the
      need of an explicit specification:
      ```rust
      #[derive_impl(frame_system::config_preludes::TestDefaultConfig)]
      impl frame_system::Config for Runtime {
        ...
      }
      ```

      In cases where the trait lies outside this scope, we would still need to specify it explicitly, 
      but this should take care of most (if not all) uses of `derive_impl` within FRAME's context.

crates: 
  - name: frame-support-procedural
  - name: pallet-default-config-example