catch 500 error for fast strategy

[Coniferish]

Closes #314

We don't support any fallback for fast strategy on images anymore, and unst will raise value error if partition uses fast strategy for image files. This catches the error and raises a 400 HTTPException.

Also, this refactors pipeline_api to extract out some validation of arguments.

[sentry-io[bot]]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ ValueError: negative seek value -1 /general/v0/general View Issue
• ‼️ AttributeError: 'NullObject' object has no attribute 'get' /general/v0/general View Issue
• ‼️ OptionError: No such keys(s): 'io.excel.zip.reader' /general/v0/general View Issue
• ‼️ UnknownModelException: Unknown model type: yolox_quantized--pdf-infer-table-structure /general/v0/general View Issue
• ‼️ TypeError: invalid length: 6 /general/v0/general View Issue

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