feat: Discord Rich Notifications

[justinjakull]

Added rich "Uptime Kuma"-like Discord embed messages to Peekaping.
Fixes #149
Both Ping and Time are conditional and only displayed if available.
I added additional bindings to make all of the features below also accessible to other notification services

NOTE: I can't do frontend (I can barely do backend, this is my first go Project), so someone else would need to add the hints for the new bindings.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 81 lines in your changes missing coverage. Please review.
✅ Project coverage is 19.82%. Comparing base (12cb83e) to head (263c2b4).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
.../modules/notification_channel/providers/discord.go	0.00%	52 Missing ⚠️
...c/modules/notification_channel/providers/common.go	0.00%	29 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #216      +/-   ##
==========================================
- Coverage   19.90%   19.82%   -0.09%     
==========================================
  Files         181      181              
  Lines       18829    18907      +78     
==========================================
  Hits         3748     3748              
- Misses      14897    14975      +78     
  Partials      184      184              

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[justinjakull]

Sorry, forgot to pull main and added Forum support. Note: I would like to add tags as well, not sure where to find the appropriate bindings though.

[Neshura87]

Would be nice if we could get this merged, it's the one gripe I currently have with peekaping