Statically define connection creation and provisioing

[Half-Shot]

This aims to nearly remove all burden on developers to modify anything outside their connection class when adding new connections. When creating a connection, developers now define their provisioning and creation functions as static functions on their connection class.

Connections can be added by simply adding a @Connection decorator.

@Connection
export class YourConnection {
....
}

[tadzik]

Huge +1 from me :) Few nitpicks.

[tadzik]

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