Slack(feat): add ability to filter by oldest and latest timerange

[noldwidjaja]

Description

Added oldest and latest message as parameter to help filter down messages in a range

Server Details

• Server: Slack
• Changes to: Tools

Motivation and Context

It helps the LLM to chunk messages that can be retrieved from Slack itself, so that it does not hit the maximum amount of tokens when retrieving slack channels with lots of messages

How Has This Been Tested?

• Existing backward compatibility test which includes the LLM not providing new parameters
• New feature test by providing the oldest param
• New feature test by providing the oldest param and the latest param
• New feature test by providing the oldest param and the latest param

Breaking Changes

No breaking changes introduced in this change

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Protocol Documentation
• My changes follows MCP security best practices
• I have updated the server's README accordingly
• I have tested this with an LLM client
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have documented all environment variables and configuration options

Additional context