feat: create Embed builder

[Fyko]

Please describe the changes this PR makes and why it should be merged:
This PR creates an Embed builder. Closes #10

Status and versioning classification:

• Code changes have been tested against the Discord API, or there are no code changes
• I know how to update typings and have done so, or typings don't need updating
• This PR changes the library's interface (methods or parameters added)

[codecov-commenter]

Codecov Report

Merging #11 (01bbcb8) into main (2aecbe4) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #11   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           15        18    +3     
  Lines          144       227   +83     
  Branches        21        33   +12     
=========================================
+ Hits           144       227   +83     

Impacted Files	Coverage Δ
src/messages/embed/Assertions.ts	100.00% <100.00%> (ø)
src/messages/embed/Embed.ts	100.00% <100.00%> (ø)
.../interactions/slashCommands/SlashCommandBuilder.ts	100.00% <0.00%> (ø)
...nteractions/slashCommands/mixins/CommandOptions.ts	100.00% <0.00%> (ø)
...s/slashCommands/mixins/CommandOptionWithChoices.ts	100.00% <0.00%> (ø)
src/interactions/slashCommands/options/number.ts	100.00% <0.00%> (ø)

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[vladfrangu]

Overall this feels more like a copy-paste from d.js (fair), without any input validation or such. Should probably get some of that rolling

[memikri]

Embed methods should return this instead of Embed to allow for chaining from extending classes.

[DTrombett]

I think this should check if all the properties are valid before setting them, like check if the title provided in setTitle is shorter than 256 characters, or if the fields are less than 25...

[Fyko]

I think this should check if all the properties are valid before setting them, like check if the title provided in setTitle is shorter than 256 characters, or if the fields are less than 25...

That's what Vlad suggested in #11 (comment) but we're waiting on a response from the big three

[vladfrangu]

I think this should check if all the properties are valid before setting them, like check if the title provided in setTitle is shorter than 256 characters, or if the fields are less than 25...

That's what Vlad suggested in #11 (comment) but we're waiting on a response from the big three

I pinged the other two to reach a consensus about passing in data in the constructor, not validating builder methods inputs :D

Also this needs a rebase

[kyranet]

Otherwise LGTM.

[vladfrangu]

• Passing data in the constructor stays!
• Validation with ow should occur in the functions (setTitle should assert that it's a string of maxlength, etc)
• Constructors shouldn't call setter functions for validating data

Any questions, hit me up @Fyko!

Stale

[vladfrangu]

You may leave your complaints in my DMs 😬