feat: add JSON read-only commands to ReadOnlyCommands

[Kiminni]

Description

This PR adds 8 JSON read-only commands to the ReadOnlyCommands list to ensure proper replica routing for RedisJSON operations.

Changes

ReadOnlyCommands.java

• Added JSON read-only commands to CommandName enum:
  • JSON_ARRINDEX
  • JSON_ARRLEN
  • JSON_GET
  • JSON_MGET
  • JSON_OBJKEYS
  • JSON_OBJLEN
  • JSON_STRLEN
  • JSON_TYPE

ClusterReadOnlyCommandsUnitTests.java

• Updated test count from 84 to 92 (reflecting 8 new commands)
• Improved enum name conversion logic for commands with dots (e.g., "JSON.GET" → "JSON_GET")

Testing

• All existing tests pass
• New JSON commands are properly recognized as read-only
• Enum name conversion works correctly for dot-containing command names

Related Issues

Resolves #3458: Extend the list of read-only commands with JSON read-only commands

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[tishun]

LGTM, thanks for the contribution!