refactor/PRO-1161/restructure-cf-pool-events

[Janislav]

Pull Request

Closes: PRO-1161

Checklist

Please conduct a thorough self-review before opening the PR.

• I am confident that the code works.
• I have updated documentation where appropriate.

Summary

Replaces the usage of base/quote asset with AssetPair in events, extrinsics and RPCs.

Non-Breaking changes

Pretty sure thats a breaking change.

[codecov]

Codecov Report

Attention: Patch coverage is 81.57895% with 28 lines in your changes are missing coverage. Please review.

Project coverage is 72%. Comparing base (95abec1) to head (0752055).

❗ Current head 0752055 differs from pull request most recent head 7ccbbb4. Consider uploading reports for the commit 7ccbbb4 to get more accurate results

Files	Patch %	Lines
api/lib/src/lp.rs	0%	14 Missing ⚠️
state-chain/pallets/cf-pools/src/lib.rs	71%	13 Missing and 1 partial ⚠️

Additional details and impacted files

@@                  Coverage Diff                   @@
##           epic/lp-api-refactors   #4718    +/-   ##
======================================================
- Coverage                     72%     72%    -0%     
======================================================
  Files                        409     409            
  Lines                      70101   69850   -251     
  Branches                   70101   69850   -251     
======================================================
- Hits                       50810   50529   -281     
- Misses                     16864   16899    +35     
+ Partials                    2427    2422     -5     

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