fix: paginator can now not use an embed

[onerandomusername]

The paginator now will not always use an embed. This allows non-embedded pagination since embeds are restricted to a maximum width which we cannot control, but codeblocks are restrained to the width of the screen.

[codecov]

Codecov Report

Merging #76 (c9b33a3) into main (4b07917) will decrease coverage by 1.55%.
The diff coverage is 10.81%.

❗ Current head c9b33a3 differs from pull request most recent head 81b5692. Consider uploading reports for the commit 81b5692 to get more accurate results

@@            Coverage Diff             @@
##             main      #76      +/-   ##
==========================================
- Coverage   70.90%   69.34%   -1.56%     
==========================================
  Files          33       33              
  Lines        1619     1628       +9     
  Branches      199      207       +8     
==========================================
- Hits         1148     1129      -19     
- Misses        439      462      +23     
- Partials       32       37       +5     

Impacted Files	Coverage Δ
tests/modmail/utils/test_pagination.py	100.00% <ø> (ø)
modmail/utils/pagination.py	33.96% <10.81%> (-9.01%)	⬇️

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[Shivansh-007]

Not tested

[onerandomusername]

Will rebase.