Enable additional RuboCop spacing rules

[kpumuk]

Enable the remaining neutral RuboCop spacing rules for operators, separators, comments, lambdas, and delimiters, then apply their autocorrections across the Ruby library, benchmarks, specs, and integration tests.

This intentionally leaves interior array and hash spacing unenforced, preserving forms such as [1, 2, 3] and {a: 5, b: 6} without creating avoidable churn.

This follows the merged Style/UnpackFirst PR #3722; its diff contains only this spacing layer.

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[Copilot]

Pull request overview

Enables additional neutral RuboCop layout/spacing cops for the Ruby subtree and applies the corresponding auto-corrections across the Ruby library, benchmarks, specs, and integration tests.

Changes:

• Turn on a set of Layout/Space* RuboCop rules in lib/rb/.rubocop.yml.
• Apply spacing fixes around operators, delimiters, and separators across Ruby implementation and test/benchmark code.
• Normalize numeric/range/operator spacing in protocol specs and JSON protocol implementation.

Reviewed changes

Copilot reviewed 1 out of 11 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/rb/integration/TestClient.rb	Adjusts assertion spacing in integration tests.
lib/rb/spec/json_protocol_spec.rb	Normalizes float division spacing in JSON protocol specs.
lib/rb/spec/compact_protocol_spec.rb	Normalizes float division spacing in compact protocol specs.
lib/rb/spec/binary_protocol_spec_shared.rb	Normalizes exponent/range-related operator spacing in shared binary protocol specs.
lib/rb/lib/thrift/transport/memory_buffer_transport.rb	Normalizes constant expression spacing.
lib/rb/lib/thrift/protocol/json_protocol.rb	Normalizes range and float division spacing in JSON protocol implementation.
lib/rb/lib/thrift/processor.rb	Normalizes string concatenation spacing in error construction.
lib/rb/benchmark/thin_server.rb	Normalizes indexing expression spacing.
lib/rb/benchmark/server.rb	Normalizes indexing expression spacing.
lib/rb/benchmark/benchmark.rb	Normalizes interpolation/concatenation spacing in formatting code.
lib/rb/.rubocop.yml	Enables additional RuboCop layout/spacing cops.

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