feat(sozo): propose multicall format for sozo auth writer

[glihm]

Auth initialization can be a very long step on public network. Having multicall support here can help.

I'm not sure if the proposed format in this PR is the most appropriate, but it's easy to script:

sozo auth writer model1,0x1234 model2,01234 model2,0x111

Open to any other suggestion!

[codecov]

Codecov Report

Attention: 18 lines in your changes are missing coverage. Please review.

Comparison is base (374f2bf) 70.06% compared to head (1ffcc16) 70.47%.
Report is 42 commits behind head on main.

Files	Patch %	Lines
bin/sozo/src/ops/auth.rs	0.00%	17 Missing ⚠️
bin/sozo/src/commands/auth.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1555      +/-   ##
==========================================
+ Coverage   70.06%   70.47%   +0.41%     
==========================================
  Files         236      261      +25     
  Lines       22531    25315    +2784     
==========================================
+ Hits        15786    17841    +2055     
- Misses       6745     7474     +729     

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