External data-loader example

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This is an example executable data-loader plugin for the Rerun Viewer.

It will log Rust source code files as markdown documents. To try it out, install it in your $PATH (cargo install --path . -f), then open a Rust source file with Rerun (rerun file.rs).

Consider using the send_columns API for data loaders that ingest time series data from a file. This can be much more efficient that the stateful log API as it allows bundling component data over time into a single call consuming a continuous block of memory.