Add ActorTemplate and ActorTemplateVersion as substrate resources; Add CRUD methods in redis package - #824

…ne proto

Introduce ActorTemplate (identity + placement policy) and
ActorTemplateVersion (immutable workload definition), along with the
supporting SandboxClass/SandboxConfig, SnapshotsConfig, ResumeSource,
and OnResumeConfig messages. Both resources are flat: workload and
status fields live directly on the message, like Actor.

The version State enum (nested in ActorTemplateVersion, like
Actor.Status) mirrors the existing ActorTemplateVersion CRD PhaseType
(RESUME_GOLDEN_ACTOR -> WAIT_GOLDEN_ACTOR -> {READY | FAILED}, with
UNSPECIFIED for the initial empty phase).

Adds per-resource store methods and the ateredis implementation for the
two new global-scoped resources, following the Atespace/Actor patterns:
SetNX creates with server-owned metadata, WATCH+version CAS update for
ActorTemplate, and SCAN-based listing.

ListActorTemplateVersions filters by parent after fetching (the parent
lives in the value, not the key); matches count toward the page so pages
stay full. DeleteActorTemplate rejects while any version names it as
parent. DeleteActorTemplateVersion rejects while it is its parent's
default_version_on_create and deletes the golden snapshot recorded in
its status before removing the version record.

… similar to the ActorSnapshotTag style