rust: pin-init: cleanup `Zeroable` and `ZeroableOptions`

Place definitions and implementations (incl. macro invocations) of
the `Zeroable` trait first in the relevant section of `src/lib.rs`,
followed by the ZeroableOption trait and its implementations.

Rename `impl_non_zero_int_zeroable_option` to `impl_zeroable_option`
for consistency.

This commit should not introduce any functional changes.

Signed-off-by: Mohamad Alsadhan <mo@sdhn.cc>
Reviewed-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260428-pin-init-sync-v1-3-07f9bd3859fb@garyguo.net
Signed-off-by: Gary Guo <gary@garyguo.net>

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