feat!: Client.on_error() improvement with new parameter

[guardboi]

Edited _run_event to pass the exception to on_error.

Summary

in client.py, line 381 has included as exc in order to pass an exception into Client.on_error. This has also been changed in line 438 to 448, changing how the error is printed as well. This makes it easier to use on_error with this small change.

Information

• This PR fixes an issue.
• This PR adds something new (e.g. new method or parameters).
• This PR is a breaking change (e.g. methods or parameters removed/renamed).
• This PR is not a code change (e.g. documentation, README, typehinting,
  examples, ...).

Checklist

• I have searched the open pull requests for duplicates.
• If code changes were made then they have been tested.
• I have updated the documentation to reflect the changes.
• If type: ignore comments were used, a comment is also left explaining why.
• I have updated the changelog to include these changes.

[codecov]

Codecov Report

Merging #1945 (37a8bd2) into master (e3ee572) will not change coverage.
The diff coverage is 33.33%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1945   +/-   ##
=======================================
  Coverage   33.13%   33.13%           
=======================================
  Files          97       97           
  Lines       19136    19136           
=======================================
  Hits         6340     6340           
  Misses      12796    12796           

Flag	Coverage Δ
macos-latest-3.10	33.11% <33.33%> (ø)
macos-latest-3.11	33.11% <33.33%> (ø)
macos-latest-3.8	33.12% <33.33%> (ø)
macos-latest-3.9	33.12% <33.33%> (ø)
ubuntu-latest-3.10	33.11% <33.33%> (ø)
ubuntu-latest-3.11	33.11% <33.33%> (ø)
ubuntu-latest-3.8	33.12% <33.33%> (ø)
ubuntu-latest-3.9	33.12% <33.33%> (ø)
windows-latest-3.10	33.11% <33.33%> (ø)
windows-latest-3.11	33.11% <33.33%> (ø)
windows-latest-3.8	33.12% <33.33%> (ø)
windows-latest-3.9	33.12% <33.33%> (ø)

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Impacted Files	Coverage Δ
discord/client.py	27.23% <33.33%> (ø)

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[plun1331]

This is a breaking change

[pullapprove4]

This pull request is in the In review step of the Default workflow.

The following review teams are pending:

• All Contributors (0 of 2 required) - waiting on review from @Lulalaby, @BobDotCom, @Middledot
• Maintainers (0 of 1 required) - waiting on review from @Lulalaby, @BobDotCom, @Middledot

[OmLanke]

Changelog entry is in the wrong section

[plun1331]

Changelog entry is in the wrong section

Fix it then :)

[OmLanke]

I'm lazy #2092 did it