deprecate network, descriptor and change_descriptor fields

[110CodingP]

Description

These fields are planned to be replaced by keyring field when we have the multi-keychain wallet so need to be deprecated following the policy in #391 .

Changelog notice

• Deprecated network, descriptor and change_descriptor fields of wallet::ChangeSet .

Checklists

All Submissions:

• I've signed all my commits
• I followed the contribution guidelines
• I ran just p before pushing

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.17%. Comparing base (c422104) to head (a8430c2).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #394   +/-   ##
=======================================
  Coverage   79.17%   79.17%           
=======================================
  Files          24       24           
  Lines        5311     5311           
  Branches      242      242           
=======================================
  Hits         4205     4205           
  Misses       1029     1029           
  Partials       77       77           

Flag	Coverage Δ
rust	79.17% <ø> (ø)

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