Design and implement support for FireStore

[kolban-google]

FireStore is a NoSQL database. This issue will track the design and development of FireStore nodes.

[kolban-google]

Design

The logical functions we want to support are:

• set - Set the content of a document.
• update - Update the content of a document.
• get - Get the content of a document.
• query - Get the set of matching documents.
• delete - Delete a document.

We will assume that msg.payload contains:

• path - The path to the doc/collection

For set and update:

• content

For query:

• where - An array containing fieldPath, opStr, value objects.

[kolban-google]

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