chore(erc20): add erc20 extension approval tests

[MalteHerrmann]

Description

This PR adds unit tests for the ERC20 extension approvals.

Additionally, some authorization related methods were added to the integration test utils.

---

Closes ENG-2285

[linear]

ENG-2285 Add ERC20 approval unit tests

[codecov]

Codecov Report

Merging #2005 (508fc5c) into main (4c251e3) will increase coverage by 0.56%.
Report is 2 commits behind head on main.
The diff coverage is 80.00%.

❗ Current head 508fc5c differs from pull request most recent head 6b6253a. Consider uploading reports for the commit 6b6253a to get more accurate results

@@            Coverage Diff             @@
##             main    #2005      +/-   ##
==========================================
+ Coverage   69.14%   69.71%   +0.56%     
==========================================
  Files         334      334              
  Lines       24837    24830       -7     
==========================================
+ Hits        17173    17309     +136     
+ Misses       6780     6627     -153     
- Partials      884      894      +10     

Files	Coverage Δ
precompiles/erc20/approve.go	82.46% <100.00%> (+82.46%)	⬆️
precompiles/erc20/query.go	8.49% <60.00%> (+8.49%)	⬆️

[Vvaradinov]

LGTM. Pending the open questions regarding authorization handling of denoms and deleting on 0 limit left.

[fedekunze]

Good findings @MalteHerrmann! left some comments

[MalteHerrmann]

After discussion the open points and adjustments will be handled on a follow-up PR to make reviews cleaner.