Add #sign block-group

[CloudM1nd3]

Created #sign block group to easely find all signs that was placed or broke.

For example, u needed to use sign action to find signs that was changed, teleport to them and then find information about sign-block.
Now u can simply use /co lookup action:block include:#sign time:1d radius:50 to find all signs was placed/broken in a radius.

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[Intelli]

Thanks for the contribution! A sign block group would be useful, but a few changes are needed before merging:

• Please use #sign to match the PR description/example and the existing singular group names.
• Populate the group using the existing version-aware sign detection (BukkitAdapter.ADAPTER.isSign(...)) instead of hardcoding newer Material constants. Those constants cause NoSuchFieldError during initialization on older supported servers. The current list also omits CRIMSON_WALL_SIGN, CRIMSON_HANGING_SIGN, and CRIMSON_WALL_HANGING_SIGN.
• Remove TRACK_ANY.addAll(SIGNS). This changes block-break logging independently of the filter and can incorrectly record a standing sign as broken when an adjacent, non-supporting block is removed. Existing attachment tracking should remain unchanged.

[CloudM1nd3]

In that case, I completely removed the hardcoded list of sign types; I hope this is the definitive solution