feat: add write function to State

[ccbrown]

What It Does

Allows you to modify State by calling .write() to get a mutable reference. E.g. my_map.write().insert(foo, bar).

Related Issues

• Feature requests #42

[codecov]

Codecov Report

Attention: Patch coverage is 86.84211% with 5 lines in your changes missing coverage. Please review.

Project coverage is 91.17%. Comparing base (e4fe60b) to head (4594098).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/iocraft/src/hooks/use_state.rs	86.84%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #45      +/-   ##
==========================================
+ Coverage   91.11%   91.17%   +0.05%     
==========================================
  Files          23       23              
  Lines        3444     3455      +11     
  Branches     3444     3455      +11     
==========================================
+ Hits         3138     3150      +12     
+ Misses        238      237       -1     
  Partials       68       68              

Files with missing lines	Coverage Δ
packages/iocraft/src/hooks/use_state.rs	91.72% <86.84%> (+1.42%)	⬆️