* GH-8625: Add Duration support for `<poller>`
Fixes https://github.com/spring-projects/spring-integration/issues/8625
The duration can be represented in a ISO 8601 format, e.g. `PT10S`, `P1D` etc.
The `<poller>` and `@Poller` don't support such a format.
* Introduce a `PeriodicTriggerFactoryBean` to accept string values for
trigger options and parse them manually before creating the target `PeriodicTrigger`
* Use this `PeriodicTriggerFactoryBean` in the `PollerParser` and `AbstractMethodAnnotationPostProcessor`
where we parse options for the `PeriodicTrigger`
* Modify tests to ensure that feature works
* Document the duration option
* Add more cross-links into polling docs
* Fix typos in the affected doc files
* Add `-parameters` for compiler options since SF 6.1 does not support `-debug` anymore
for method parameter names discovery
* Fix typos
Co-authored-by: Gary Russell <grussell@vmware.com>
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Co-authored-by: Gary Russell <grussell@vmware.com>