Add email/username changed event

[salihozkara]

Description

When changing email/username, there may be scenarios where the old email/username is needed. For this reason, when the email/username changes, publish a distributed event containing the old email/username.

Breaking Change

Added IDistributedEventBus to IdentityUserManager's constructor

Checklist

• I fully tested it as developer
• I documented it (or no need to document or I will create a separate documentation issue)

[codecov]

Codecov Report

Merging #17990 (d383249) into dev (d5c3619) will increase coverage by 0.02%.
Report is 12 commits behind head on dev.
The diff coverage is 100.00%.

❗ Current head d383249 differs from pull request most recent head c0a7762. Consider uploading reports for the commit c0a7762 to get more accurate results

@@            Coverage Diff             @@
##              dev   #17990      +/-   ##
==========================================
+ Coverage   51.64%   51.66%   +0.02%     
==========================================
  Files        3052     3054       +2     
  Lines       95472    95501      +29     
  Branches     7615     7613       -2     
==========================================
+ Hits        49308    49343      +35     
+ Misses      44647    44643       -4     
+ Partials     1517     1515       -2     

Files	Coverage Δ
...d/Volo/Abp/Identity/IdentityUserEmailChangedEto.cs	100.00% <100.00%> (ø)
...olo/Abp/Identity/IdentityUserUserNameChangedEto.cs	100.00% <100.00%> (ø)
...ty.Domain/Volo/Abp/Identity/IdentityUserManager.cs	67.50% <100.00%> (+5.51%)	⬆️

... and 2 files with indirect coverage changes

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