Provide defaults for optional CrateInfo fields in _create_crate_info (#4322)

Currently, `_create_crate_info` only provides defaults for a small
subset of the fields on the `CrateInfo` provider. If custom rules
instantiate `CrateInfo` using only the fields they care about, they are
susceptible to sudden runtime `AttributeError` crashes if `rules_rust`
internal logic is updated to unconditionally access a field that wasn't
previously required.

This PR adds defaults for all remaining non-essential fields in
`_create_crate_info` and the only fields left without defaults are the
strictly required semantic fields (`name` and `type`).

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Signed-off-by: Taylor Edwards <tayloredwards@google.com>