feat: implement derive macro for all access types

[mkroening]

This is the reason for my new barrage of PRs. Turns out, I ran into the need for using read-only pointers sooner than I expected.

This PR adds the derive macro functionality to volatile pointers of all access types.
This is done without introducing new derived traits, but by generically implementing the derived trait for all access types and determining the correct access type from self and the field's specification via the generalized restrict method from #60.

This PR depends on the following PRs:

• Fix warnings and deny warnings in CI #56 (optional)
• fix(macro): support #[repr(align(N))] #57 (optional)
• fix(access): properly seal access traits #59 (optional)
• feat: introduce RestrictAccess<To> and generalize restrict to all access types #60 (required)

[phil-opp]

Looks good, thanks for all your work!