feat(Util): escape more markdown characters

[RedGuy12]

Please describe the changes this PR makes and why it should be merged:
Allows for escaping more characters in escapeMarkdown and adds the corresponding individual functions:

• escape characters (resolves escapeMarkdown does not escape backslashes #8689)
• bulleted and numbered lists, and headings (new markdown only supported in forum guidelines and starter messages; resolves https://discord.com/channels/222078108977594368/1019980824365506570)
• masked links (only supported in webhook messages)

I enabled the escapeEscapes option by default since you can add those to any message, but since lists, headings, and masked links are only supported in specific contexts I disabled them by default. The escapeMarkdown function now returns different information by default because escapeEscapes is enabled by default. If this is a problem, I can disable it by default until the next major release.

Status and versioning classification:

• This PR changes the library's interface (methods or parameters added)
• This PR includes potentially breaking changes (methods removed or renamed, parameters moved or removed)
• I know how to update typings and have done so, or typings don't need updating

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Name	Status	Preview	Updated
discord-js	✅ Ready (Inspect)	Visit Preview	Oct 10, 2022 at 5:20AM (UTC)
discord-js-guide	✅ Ready (Inspect)	Visit Preview	Oct 10, 2022 at 5:20AM (UTC)

[codecov]

Codecov Report

Merging #8701 (a7bb52b) into main (3ed668e) will increase coverage by 0.03%.
The diff coverage is n/a.

❗ Current head a7bb52b differs from pull request most recent head 49788aa. Consider uploading reports for the commit 49788aa to get more accurate results

@@            Coverage Diff             @@
##             main    #8701      +/-   ##
==========================================
+ Coverage   86.83%   86.86%   +0.03%     
==========================================
  Files          87       87              
  Lines        8810     8815       +5     
  Branches     1117     1103      -14     
==========================================
+ Hits         7650     7657       +7     
+ Misses       1118     1116       -2     
  Partials       42       42              

Flag	Coverage Δ
builders	100.00% <ø> (ø)
collection	100.00% <ø> (ø)
proxy	81.53% <ø> (ø)
rest	92.07% <ø> (+<0.01%)	⬆️
util	100.00% <ø> (ø)
utilities	100.00% <ø> (ø)
voice	63.83% <ø> (+0.12%)	⬆️
ws	59.89% <ø> (+0.13%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
packages/rest/src/lib/utils/constants.ts	100.00% <0.00%> (ø)
...ackages/voice/src/util/generateDependencyReport.ts	0.00% <0.00%> (ø)
packages/ws/src/utils/constants.ts	85.07% <0.00%> (+1.20%)	⬆️

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