Skills decoupling

[ea-rus]

Description

Changes:

• Tolls for skills are created outside of langchain. And then wrapped to langchain objects inside of langchain handler
• added 'database' param to ExecuteCommands.execute_command. It allows to execute query on different databases using the same 'ExecuteCommands' instance
• removed 'executor' arg for langchain_handler

Dependent on #8765

Fixes #issue_number

Type of change

• ⚡ New feature (non-breaking change which adds functionality)

Verification Process

To ensure the changes are working as expected:

• Test Location: Specify the URL or path for testing.
• Verification Steps: Outline the steps or queries needed to validate the change. Include any data, configurations, or actions required to reproduce or see the new functionality.

Additional Media:

• I have attached a brief loom video or screenshots showcasing the new functionality or change.

Checklist:

• My code follows the style guidelines(PEP 8) of MindsDB.
• I have appropriately commented on my code, especially in complex areas.
• Necessary documentation updates are either made or tracked in issues.
• Relevant unit and integration tests are updated or added.

[dusvyat]

Nice work 🚀