feat(policies): add Policy CRUD methods for Unified Policy Architecture

Add comprehensive policy management methods to the Java SDK as part of
the Unified Policy Architecture v2.0.0 (Phase 10 - SDKs).

Static Policies:
- listStaticPolicies() with filtering options
- getStaticPolicy(), createStaticPolicy(), updateStaticPolicy()
- deleteStaticPolicy(), toggleStaticPolicy()
- getEffectiveStaticPolicies(), testPattern(), getStaticPolicyVersions()

Policy Overrides (Enterprise):
- createPolicyOverride(), getPolicyOverride(), deletePolicyOverride()

Dynamic Policies:
- listDynamicPolicies() with filtering options
- getDynamicPolicy(), createDynamicPolicy(), updateDynamicPolicy()
- deleteDynamicPolicy(), toggleDynamicPolicy()
- getEffectiveDynamicPolicies()

New types in PolicyTypes.java:
- PolicyCategory, PolicyTier, PolicyAction, OverrideAction enums
- StaticPolicy, DynamicPolicy, PolicyOverride models
- CreateStaticPolicyRequest, UpdateStaticPolicyRequest builders
- CreateDynamicPolicyRequest, UpdateDynamicPolicyRequest builders
- ListStaticPoliciesOptions, ListDynamicPoliciesOptions
- TestPatternResult, PolicyVersion

Tests: 38 tests covering all methods and type validation

Part of: Epic #724 - Unified Policy Architecture v2.0.0

Author: saurabhjain1592