Restore Backend Logging Framework w/ Winston MongoDB transport.

[swoocn]

PR Recovery of #40 due to accidental PR merge without addressing TODOs.

[see commits]

TODOs before PR merge

• Hide SQL DB credentials; stash into secrets/ environment variables.
• Log level and logging instances - are we logging what is only necessary and to keep from filling up the tables with just "stuff"?
• Build VERCEL_ENV variable for Prod in the backend server (API hosting); has this been done @soleil00?
• Currently, the primary key in the table is the timestamp value; this will eventually be changed to sessionId+timestamp.
• Will need to share AppDev access to Azure SQL DB client.

Mongo DB logging ->

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