[WIP] feat(Structures): Basic structures - Embed & BaseEmoji

[kernel-dev]

Please describe the changes this PR makes and why it should be merged: This PR is to keep track of the progress on some basic structures that I will be writing.

Status Work in progress.

List of assignments:

• Create MessageEmbed instance — add all corresponding methods and properties, as well as getters.

• Write necessary stuff to @discordjs/types

• Document the instances and their methods accordingly (correctly).

• Write tests (I would require someone to assist me with this, as I do not know how to do this correctly).

• [ ] Code changes have been tested against the Discord API, or there are no code changes

Semantic versioning classification:

• [x] This PR changes the library's interface (methods or parameters added)
  • [ ] This PR includes breaking changes (methods removed or renamed, parameters moved or removed)
• [ ] This PR only includes non-code changes, like changes to documentation, README, etc.

[codecov[bot]]

Codecov Report

Merging #24 into master will not change coverage by %. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master       #24   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            3         3           
  Lines          142       142           
  Branches        42        42           
=========================================
  Hits           142       142           

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