[SR-12150] Enable differentiation of class methods

[dan-zheng]

Previous ID	SR-12150
Radar	None
Original Reporter	@dan-zheng
Type	Sub-task
Status	Closed
Resolution	Done

Additional Detail from JIRA

Votes	0
Component/s
Labels	Sub-task
Assignee	@dan-zheng
Priority	Medium

md5: 56246b331dd0f98c7fe1963359ea2479

Parent-Task:

• SR-12148 Make differentiation work with class types

Issue Description:

Enable differentiation of class methods.
This requires adding JVP/VJP entries to vtables, similar to how entries are added to protocol witness tables.
Prototype and detailed explanation by @marcrasi.

[dan-zheng]

Done in #26050