[#2685] implement a thread-safe switch db context manager#2686

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nzjess wants to merge 4 commits intoMongoEngine:masterfrom nzjess:threadsafe-switch-db-context-manager

Commits on Aug 19, 2022

[MongoEngine#2685 ] implement a thread-safe switch db context manager
Jesse McLaughlin
committed

Commits on Aug 30, 2022

[MongoEngine#2685 ] support a stack of db switches
Jesse McLaughlin
committed

Commits on Sep 3, 2022

[MongoEngine#2685 ] document classes now cache a collection db alias that can be different per thread
Jesse McLaughlin
committed

Commits on Sep 23, 2022

[MongoEngine#2685 ] properly initialise db_alias map for each thread
Jesse McLaughlin
committed