Card Parts Bottom Sheet View Controller

[rcole34]

Before you make a Pull Request, read the important guidelines:

Issue Link :link:

• Is this a bug fix or a feature? Feature!
• Does it break any existing functionality? Nope.

Goals of this PR :tada:

• Why is the change important? Adds a new component that provides a new functionality to CardParts with extensive use cases.
• How far has it been tested? Extensive manual testing with some added unit tests.

How Has This Been Tested :mag:

Tested manually through examples in CardParts example app, and tested through unit tests.

Test Configuration :space_invader:

• Xcode version: 11.2.1
• Device/Simulator iPhone11 Pro
• iOS version 13.2.2|| MacOSX version 10.14.6

Things to check on :dart:

• [x] My Pull Request code follows the coding standards and styles of the project
• [x] I have worked on unit tests and reviewed my code to the best of my ability
• [x] I have used comments to make other coders understand my code better
• [x] My changes are good to go without any warnings
• [x] I have added unit tests both for the happy and sad path
• [x] All of my unit tests pass successfully before pushing the PR
• [x] I have made sure all dependent downstream changes impacted by my PR are working