Convert ObjectReaderInjector/ObjectWriterInjector to use new (2.16) pluggable RecyclerPool instead of hard-coded one

[cowtowncoder]

Similar to FasterXML/jackson-dataformats-binary#399 (and others) (based on changes for FasterXML/jackson-core#1089)
we need to allow re-configuring of recyclers used for recycling ObjectReaderModifier/ObjectWriterModifier instances: mostly for new Project Loom (where ThreadLocal based approach won't work well) but also allow users to use more optimal pooling in general.

Ideally changes would go in 2.16, leaving default impl in use but allowing re-configuration.

[cowtowncoder]

Actually, I forgot what ThreadLocal is used for here: it is not for Object recycling but for "AOP" style injection of modifiers.
Hence cannot be simply replaced -- if changes needed, need to think through using something else.