Add utility to parse Duration from a String

[mp911de]

It would make sense to have a common utility to parse java.time.Duration from a CharSequence.

Examples:

• 10ms -> 10 milliseconds
• 10s -> 10 seconds
• 10m -> 10 minutes
• 10h -> 10 hours

ChronoUnits to support:

• Nanos
• Micros
• Millis
• Seconds
• Minutes
• Hours
• Days

Spring Boot provides this functionality and we'd like to reuse it in Spring Data.

[ilyavy]

Relates to #22013

[rstoyanchev]

Team Decision: We can do this in fallback mode, trying the built-in Duration formatting, and then falling back on alternative formats, in effect extending the built-in one. We should ensure the spec of what Boot supports already, works in the new arrangement.

[simonbasle]

linked to #22013 and superseded by gh-30396