rust: init: add `{pin_}chain` functions to `{Pin}Init<T, E>`

The `{pin_}chain` functions extend an initializer: it not only
initializes the value, but also executes a closure taking a reference to
the initialized value. This allows to do something with a value directly
after initialization.

Suggested-by: Asahi Lina <[email protected]>
Reviewed-by: Martin Rodriguez Reboredo <[email protected]>
Signed-off-by: Benno Lossin <[email protected]>
Reviewed-by: Alice Ryhl <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[ Cleaned a few trivial nits. ]
Signed-off-by: Miguel Ojeda <[email protected]>

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