Add Persys Go SDK scaffold

[miladhzzzz]

Motivation

• Provide a single reusable Go SDK for Persys Cloud so persysctl can become a thin CLI and client logic is centralized.
• Support both gRPC and HTTP transports and integrate with the existing pkg/certmanager TLS flow to match current persysctl behavior.
• Include manifest ingestion and GitOps watch helpers to enable stack/git-based workflows and future features (metrics, drain/taint, etc.).

Description

• Add a new sdk Go module with public entry points (sdk.New, sdk.DefaultOptions) and packages: client, options, types, ingestion, and gitops (core scaffolding and README).
• Implement a core client.Client with gRPC and lazy HTTP transport selection, context-aware wrappers for existing controlv1 APIs, Close(), and %w-style error wrapping (sdk/client/client.go).
• Integrate TLS using the shared pkg/certmanager behavior in LoadTLSConfig, supporting insecure mode, certmanager validation, client cert loading, and CA pool setup (sdk/client/certs.go).
• Add ingestion helpers for YAML/JSON/Docker Compose and Git URL detection (sdk/ingestion), and a GitOps watcher for local fs events (fsnotify) and remote repo polling via git pull (sdk/gitops/watcher.go).
• Add lightweight SDK-only types (sdk/types) and unit tests for New() and LoadTLSConfig behavior (sdk/client/client_test.go).

Testing

• Ran go test ./... in the new module, which passed (client tests executed; other packages had no test files).
• Built the module with go build ./..., which completed successfully.

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[parmisk80]

/LGTM

[miladhzzzz]

Documentation needs updating before merge can happen