Add Native prefix (Period, TimeZone)

[solodkiy]

• Period::fromNativeDateInterval
• Period::toNativeDateInterval
• TimeZone::fromNativeDateTimeZone
• TimeZone::toNativeDateTimeZone

47

[BenMorel]

Thank you, do you want to convert other methods in separate PRs? In this case, please fixup the skip psalm check commit onto the correct commit to keep a clean history, as I won't squash those.

[BenMorel]

Thank you, @solodkiy!