Modernize Ruby, Fluentd support and CI

[daichirata]

Summary

• Drop EOL Ruby and Fluentd v0.14; require Ruby >= 3.2 and fluentd >= 1.0
• Replace defunct wercker CI with GitHub Actions matrix (Ruby 3.2 / 3.3 / 3.4 / 4.0)
• Modernize plugin code to current Fluentd v1.x style (top-level requires, drop redundant initialize)
• Bump version to 0.4.0
• Expand test coverage: error event emission, parse-error fallback, suppress_parse_error_log

Changes

Dependencies / metadata

• required_ruby_version = ">= 3.2"
• fluentd constraint: >= 0.14.0, < 2 → >= 1.0, < 2
• bundler ~> 1.11 → unpinned, rake ~> 10.0 → ~> 13.0, pin test-unit ~> 3.6
• README requirement table updated, wercker badge replaced with GH Actions badge

CI

• Delete wercker.yml (service shut down)
• Add .github/workflows/test.yml with ruby/setup-ruby@v1 + bundler-cache

Plugin code (filter_uri_parser.rb / filter_query_string_parser.rb)

• Add require 'fluent/plugin/filter' and require 'addressable/uri' at file top
• Remove initialize (only called super and lazy-required addressable)

Tests

• test/helper.rb: drop require 'rubygems', drop Bundler.setup guard, drop nulllogger pattern, include Fluent::Test::Helpers
• Use event_time("...") helper instead of Fluent::EventTime.from_time(Time.parse(...))
• New tests (3 each per filter):
  • test_filter_emit_invalid_record_to_error_on_missing_key
  • test_filter_parse_error_is_swallowed
  • test_filter_suppress_parse_error_log

Test plan

• bundle exec rake test on Ruby 3.3 — 17 tests / 77 assertions / 0 failures
• Plugin files load standalone (ruby -Ilib -rfluent/plugin/filter_uri_parser)
• GitHub Actions matrix passes on Ruby 3.2 / 3.3 / 3.4 / 4.0

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