[Guava] Allow `@JsonDeserialize(contentConverter=...)` for Immutable Maps and Lists

[JooHyukKim]

Can solve #92

[cowtowncoder]

Thank you @JooHyukKim ! This JUST makes it in 2.15.0 -- about to start release.

Great work, as usual; some of simple fixes like this might still exist for other collections too (like Eclipse collections).

[JooHyukKim]

Great work, as usual; some of simple fixes like this might still exist for other collections too (like Eclipse collections).

🥹 Thank you for your kind words! I will try to look into other collections 🙏🏼