Memory provider

[daedalus28]

This adds a quick draft of a memory provider, which implements most of the example types as in memory transforms on a records array provided on the schema definitions.

This serves a few purposes:

• Provides better test coverage by including a much more realistic test case in the core (to help us be more confident that there are no breaking changes in the upcoming refactor for subquery)
• Makes our tests able to actually validate known outputs from a fixed data set
• Provides a clear example of how to build a custom provider without worrying about any database specific quirks.
• Provides an example of a non database driven provider to help spark community creativity (this might be wishful thinking 😂)
• Provides a potentially easier to follow explanation of what the example types do since the in-memory processing is just plain JS with no external DB knowledge required
• Lays the groundwork for the future real-time functionality which will use this to determine if an incoming record matches parts of the current tree

[decrapifier]

	Warnings
:warning:	:exclamation: This PR is BIG (+106869 -3) Please keep it below 500 net changes
:warning:	You should add at least 1 more reviewer to the PR
:warning:	The README has not been updated. Please update the README.

	Messages
:book:	Awesome! Thanks for the well-formatted PR!

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