This commit incorporates the changes from replicate#386 as well as removing
mention of the data URLs added in 86c5e14.

)

This commit adds tests for the `file_encoding_strategy` argument for
`replicate.run()` and fixes two bugs that surfaced:

1. `replicate.run()` would convert the file provided into base64 encoded
data but not a valid data URL. We now use the `base64_encode_file`
function used for outputs.
2. `replicate.async_run()` accepted but did not use the
`file_encoding_strategy` flag at all. This is fixed, though it is worth
noting that `base64_encode_file` is not optimized for async workflows
and will block. This might be okay as the file sizes expected for data
URL payloads should be very small.

This commit introduces support for the cog context into the Replicate
SDK. The `current_scope` helper now makes per-prediction context
available via the `current_scope().context` dict.

A cog model can then provide a REPLICATE_API_TOKEN on a per-prediction
basis to be used by the model.

    def predict(prompt: str) -> str:
        replicate = Replicate()
        output = replicate.run("anthropic/claude-3.5-haiku", {input:
{"prompt": "prompt"}})
        return output

Co-authored-by: Philip Potter <philip.g.potter@gmail.com>

This migrates the project from using `rye` to `uv`, both tools provided
by astral.sh but the latter is deemed to be the successor:

https://lucumr.pocoo.org/2024/2/15/rye-grows-with-uv/

The scripts should all work as before.