docs: add 1.0.0 migration guide

[ion-elgreco]

Description

Will be shown here: https://delta-io.github.io/delta-rs/upgrade-guides/guide-1.0.0 once release is done.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.92%. Comparing base (7392171) to head (d1b7e70).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3443      +/-   ##
==========================================
- Coverage   71.92%   71.92%   -0.01%     
==========================================
  Files         152      152              
  Lines       46544    46544              
  Branches    46544    46544              
==========================================
- Hits        33479    33478       -1     
- Misses      10906    10912       +6     
+ Partials     2159     2154       -5     

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