Query owner on ERC-721 and ERC-1155 pointers

[jewei1997]

Describe your changes and provide context

Add an owner() function that adheres to the Ownable interface. Note: we are only adding the ability to query the owner, not the ability to change the owner. CW721_ownable has the concept of the new owner accepting the new ownership for the ownership transfer to go through which ERC Ownable does not have which makes it tricky to do the write functions of actually updating ownership.

Testing performed to validate your change

integration test

[codchen]

do we want to add migration handler to update existing deployed pointers to use this new code?

[dvli2007]

The CW1155 contract follows the same ownership pattern as CW721s. We should add that functionality into the CW1155ERC1155Pointer.sol as well

[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 61.27%. Comparing base (41433a8) to head (b9b6cda).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
x/evm/module.go	25.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2043      +/-   ##
==========================================
+ Coverage   61.16%   61.27%   +0.10%     
==========================================
  Files         264      264              
  Lines       24566    24569       +3     
==========================================
+ Hits        15026    15054      +28     
+ Misses       8415     8386      -29     
- Partials     1125     1129       +4     

Files with missing lines	Coverage Δ
x/evm/module.go	37.98% <25.00%> (-0.56%)	⬇️

... and 3 files with indirect coverage changes

[jewei1997]

I think this was previously off by one