Sweep: Update Default 'limit' Parameter to 30 in CLI

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Description

This pull request updates the default value of the limit parameter from 20 to 30 across various components of the project. This change ensures that users can fetch up to 30 items by default, enhancing the data retrieval capabilities without the need for manual adjustments.

Summary

• Updated the default value of the limit parameter from 20 to 30 in the README.md documentation to reflect the new default setting accurately.
• Modified the default limit value in the cmd/jaeger-exporter/main.go file to ensure the application's command-line interface aligns with the updated default settings.
• Ensured consistency in the default limit parameter across documentation and codebase to improve user experience and reduce confusion.

Fixes #4.

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Rollback Files For Sweep

• Rollback changes to cmd/jaeger-exporter/main.go
• Rollback changes to README.md

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