Allow more flexible Duration parsing

[philwebb]

Binding to Duration is currently cumbersome. It would be nice if we could parse simpler formats like 10s, 10m etc.

[philwebb]

Originally part of PR #11071 but we should have a consistent solution that's the same for all binding, not just micrometer.

[snicoll]

@philwebb this support is quite awesome. There are a bunch of places where we use a long to express a value in milliseconds. Would it be possible to support that as well? If we did somehow that would be a great migration path for users then: they could keep the raw value (e.g. 10000) or migrate to the new format (10s).

[wilkinsona]

If the converter could treat no unit as milliseconds, perhaps we could then change a millisecond property that’s a long to be a Duration instead?

[snicoll]

That's the exact reason why I am asking for that support.

[philwebb]

Adding a no suffix == milliseconds should be easy and I like the idea of converting longs to Duration

[snicoll]

That's awesome. There are a couple of comments on the commit, reopening to make sure they're not missed.