feat: Add data attribute to all raw event payloads

[NeloBlivion]

Summary

Raw events are useful for working with lower level data without relying on cache, however in many cases we still do our own processing through pycord models or try to get objects from cache. The data attribute will let users access the raw data from Discord for them to inspect themselves, and would also be useful to access attributes from the API that haven't been implemented in the library yet.

This attribute was already available in some raw events, so now it has been expanded to all.

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 #2023 (5acd714) into master (3847a8c) will decrease coverage by 0.02%.
The diff coverage is 40.90%.

❗ Current head 5acd714 differs from pull request most recent head f953384. Consider uploading reports for the commit f953384 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2023      +/-   ##
==========================================
- Coverage   33.29%   33.28%   -0.02%     
==========================================
  Files          97       97              
  Lines       18940    18946       +6     
==========================================
  Hits         6307     6307              
- Misses      12633    12639       +6     

Flag	Coverage Δ
macos-latest-3.10	33.27% <40.90%> (-0.02%)	⬇️
macos-latest-3.11	33.27% <40.90%> (-0.02%)	⬇️
macos-latest-3.8	33.28% <40.90%> (-0.02%)	⬇️
macos-latest-3.9	33.28% <40.90%> (-0.02%)	⬇️
ubuntu-latest-3.10	33.27% <40.90%> (-0.02%)	⬇️
ubuntu-latest-3.11	33.27% <40.90%> (-0.02%)	⬇️
ubuntu-latest-3.8	33.28% <40.90%> (-0.02%)	⬇️
ubuntu-latest-3.9	33.28% <40.90%> (-0.02%)	⬇️
windows-latest-3.10	33.27% <40.90%> (-0.02%)	⬇️
windows-latest-3.11	33.27% <40.90%> (-0.02%)	⬇️
windows-latest-3.8	33.28% <40.90%> (-0.02%)	⬇️
windows-latest-3.9	33.28% <40.90%> (-0.02%)	⬇️

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Impacted Files	Coverage Δ
discord/raw_models.py	27.86% <40.90%> (-1.62%)	⬇️

... and 2 files with indirect coverage changes

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