feat(world): add system signatures to FunctionSignatures

[yonadaaa]

Solves #2382

[changeset-bot]

🦋 Changeset detected

Latest commit: b5549d0

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 31 packages

Name	Type
@latticexyz/world	Patch
@latticexyz/cli	Patch
@latticexyz/dev-tools	Patch
@latticexyz/store-sync	Patch
@latticexyz/world-modules	Patch
@latticexyz/store-indexer	Patch
@latticexyz/abi-ts	Patch
@latticexyz/block-logs-stream	Patch
@latticexyz/common	Patch
@latticexyz/config	Patch
create-mud	Patch
@latticexyz/ecs-browser	Patch
@latticexyz/faucet	Patch
@latticexyz/gas-report	Patch
@latticexyz/network	Patch
@latticexyz/noise	Patch
@latticexyz/phaserx	Patch
@latticexyz/protocol-parser	Patch
@latticexyz/react	Patch
@latticexyz/recs	Patch
@latticexyz/schema-type	Patch
@latticexyz/services	Patch
@latticexyz/solecs	Patch
solhint-config-mud	Patch
solhint-plugin-mud	Patch
@latticexyz/std-client	Patch
@latticexyz/std-contracts	Patch
@latticexyz/store-cache	Patch
@latticexyz/store	Patch
@latticexyz/utils	Patch
mock-game-contracts	Patch

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[yonadaaa]

We also set the world function selector in registerRootFunctionSelector. Do we need to do set the system one there or are they the same?

[holic]

they're the same!