feat: Support dynamic query parameter on reconnect

[jsonbailey]

Note

Introduces dynamic query parameter support for the SSE client.

• Adds Client#query_params callback to compute query params before each connection/reconnection; merges with existing URI params (dynamic values can override), URL-encodes values, and safely handles nil/empty/non-Hash returns or exceptions
• Connection now uses build_uri_with_query_params to construct the request URI
• Comprehensive specs cover initial connection, reconnection updates, merging/overriding, error/nil handling, URL encoding, and multiple params
• RuboCop config: switch to plugins and rename Naming/PredicateName to Naming/PredicatePrefix

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