First go at reaction duplication

[AverageHelper]

New stuff:

• The bot now duplicates some initial message reactions.
  • ⭐ is ignored
  • 1 in 5 chance for :same: and :no_u:
  • 1 in 100 for every other emoji
  • Emoji names are case-normalized (e.g. any capitalization of :same: will do)

I anticipate we can make these odds configurable once we have the database fleshed out. We'd need at least:

• Some place to store the default reaction chance
• Some place to store the names and off-chances of each special emoji
• Some way to tie those emoji to the eventual X-board (to prevent the bot from affecting those stats) without excess database I/O

Closes #24

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟢	Statements	97.68% (+1.53% 🔼)	505/517
🟢	Branches	92.55% (+4.88% 🔼)	149/161
🟢	Functions	95.95% (+1.43% 🔼)	71/74
🟢	Lines	97.62% (+1.57% 🔼)	493/505

Show new covered files 🐣

St.❔	File	Statements	Branches	Functions	Lines
🟢	... / messageReactionAdd.ts	100%	93.33%	100%	100%
🟢	... / reactionDuplication.ts	100%	100%	100%	100%

Test suite run success

138 tests passing in 26 suites.

Report generated by 🧪jest coverage report action from 5364368

[JstnMcBrd]

Might be best to put the DEFAULT_CHANCE and odds in the constants file, at least for now.