[ObjC] Add support for removing runtime calls that perform retain count operations

A new activity is added that will remove calls to `objc_retain`,
`objc_release`, `objc_autorelease`, and related functions. It is
disabled by default due to the fact it changes the semantics of the
code. It can be enabled on a per-function basis via the Function
Settings context menu or command palette entry. Alternatively, it can be
enabled in Open with Options or in user settings if a user would prefer
it be on for an entire file or for all files they open.

For now the activity is only eligible within arm64 binaries. Supporting
x86_64 will require matching some slightly different IL patterns.

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