Initial work on closing GC holes in bindings

[filipnavara]

• Generate GC.KeepAlive where necessary in bgen
• Add analyzer to flag missing GC.KeepAlive calls
• Update manual bindings to fix errors from the analyzer

Contributes to #10146

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[filipnavara]

The analyzer is not fool-proof. For example, it doesn't understand generic parameters with constraints. The dataflow analysis could be done in more optimal way but I opted to get something simple and working first.