Initial implementation of the totext plugin

Extract plain text from various file formats using PHP only (no shell-outs,
no external binaries). Provides a CLI component (cli_plugin_totext) and a
help

Initial implementation of the totext plugin

Extract plain text from various file formats using PHP only (no shell-outs,
no external binaries). Provides a CLI component (cli_plugin_totext) and a
helper component (helper_plugin_totext).

Supported formats:
- OOXML: docx, xlsx, pptx
- OpenDocument: odt, ods, odp
- PDF (via bundled smalot/pdfparser)
- Plain-text family: txt, csv, md, markdown, log, text
- Image metadata (EXIF/IPTC): jpg, jpeg, tif, tiff

Includes a fixture-based test suite covering every extractor, the factory
routing, and the helper end to end.

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