[C#] Convert *UnsafeContext to structs and acquire on demand#750

Merged

badrishc merged 3 commits intomainfrom unsafecontext-struct

Sep 23, 2022

+584-613

Commits on Sep 23, 2022

Make *UnsafeContext a struct and acquire on demand (like LockableContext); change Resume/SuspendThread naming to Begin/EndUnsafe and add Begin/EndLockable
TedHartMS
committed
Add AcquireLockable check for in-prepare checkpoint
TedHartMS
committed
nits
badrishc
committed