Mark create_or_approve as deprecated

[adamdossa]

changelog

modified API

• multisig::create_or_approve_as_key and multisig::create_or_approve_as_identity are both deprecated in favour of their create / approve versions.

[codecov[bot]]

Codecov Report

Merging #1541 (43cc9b7) into develop (612bda0) will decrease coverage by 0.01%. Report is 2 commits behind head on develop. The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop    #1541      +/-   ##
===========================================
- Coverage    58.31%   58.31%   -0.01%     
===========================================
  Files          142      142              
  Lines        31505    31507       +2     
===========================================
+ Hits         18372    18373       +1     
- Misses       13133    13134       +1     

Files	Coverage Δ
pallets/multisig/src/lib.rs	86.29% <100.00%> (+0.03%)	:arrow_up:

... and 4 files with indirect coverage changes