Add Cryptography APIs to the Java SDK

[siri-varma]

Description

Implements the Cryptography Alpha1 API (EncryptAlpha1/DecryptAlpha1) for the Dapr Java SDK, enabling streaming encryption and decryption operations using Dapr's cryptography building block.

Changes

• Added EncryptRequestAlpha1 and DecryptRequestAlpha1 domain objects with fluent setters
• Added encrypt() and decrypt() methods to DaprPreviewClient interface
• Implemented streaming gRPC bidirectional communication in DaprClientImpl
• Added unit tests for domain objects
• Added integration tests using Testcontainers with local storage crypto component

Issue reference

Closes #1073

Checklist

• [x] Code compiles correctly
• [x] Created/updated tests
• [x] Extended the documentation

[codecov[bot]]

Codecov Report

:x: Patch coverage is 85.10638% with 21 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 78.82%. Comparing base (d759c53) to head (bb8a9d4). :warning: Report is 242 commits behind head on master.

Files with missing lines	Patch %	Lines
...k/src/main/java/io/dapr/client/DaprClientImpl.java	81.41%	14 Missing and 7 partials :warning:

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1599      +/-   ##
============================================
+ Coverage     76.91%   78.82%   +1.90%     
- Complexity     1592     1996     +404     
============================================
  Files           145      219      +74     
  Lines          4843     6111    +1268     
  Branches        562      676     +114     
============================================
+ Hits           3725     4817    +1092     
- Misses          821      946     +125     
- Partials        297      348      +51     

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