[DRAFT] Converters for Frontend

[jbolor21]

Description

[WIP] Adding converters to the GUI interface

Current progress:

• we can open a converter pane & select converter
• can see which converters use an LLM
• see a conversion preview

Still to do:

• stack converters (ie let user use > 1)
• clean up UI - current barebones are in
• automatically preview conversion for non-LLM based converters
• ensure the "converted" version is sent ie not double converting
• Only show relevant converters
• maybe info panel for converter and/or parameters
• Clean up parameters UI - add variable type only acceptance ie toggle for boolean values

Tests and Documentation

Testing manually with UI, adding end to end tests, & unit tests