Restructure (9): Make State interface and Hooks public

[roosterfish]

This is the ninth PR taken from a single commit in #534 (even though in this case the actual changes are very different from the original commit).
The final package layout will be different but to allow reviewing the changes in smaller chunks I will split this PR by its commits.

In this PR the State interface can finally be moved to a public package together with the Hooks struct which allows removing the import indirection which was previously necessary to be able to access both the State and Hooks.

[Copilot]

Pull request overview

This PR restructures the codebase by moving the State interface and Hooks struct from internal packages to the public microcluster/types package, eliminating the previous import indirection through type aliases.

Changes:

• Moved State interface from internal/state/state.go to microcluster/types/state.go as a public interface
• Moved Hooks struct from internal/state/hooks.go to microcluster/types/hooks.go as a public struct
• Removed the state/state.go package that previously provided type aliases for these types
• Updated all import statements and function signatures across the codebase to use types.State and types.Hooks instead of state.State and state.Hooks

Reviewed changes

Copilot reviewed 25 out of 25 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
state/state.go	Removed type alias package that provided public access to internal types
microcluster/types/state.go	Added public State interface definition with all required methods
microcluster/types/hooks.go	Added public Hooks struct definition with all hook function fields
microcluster/rest/rest.go	Updated EndpointAction to use types.State in function signatures
internal/state/state.go	Removed State interface definition and updated Hooks field type, updated ToInternal signature
internal/state/hooks.go	Removed Hooks struct (moved to public package)
internal/rest/rest.go	Updated function signatures to use types.State
internal/rest/resources/*.go	Updated all resource handler function signatures to use types.State
internal/rest/access/authentication.go	Updated authentication functions to use types.State
internal/daemon/daemon.go	Updated daemon to use types.Hooks and types.State throughout
example/cmd/microd/main.go	Updated example hooks to use types.Hooks and types.State
example/api/extended.go	Updated extended API handlers to use types.State

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