gguf : add file format specification (#302)

gguf : add file format specification (#302)

* docs: gguf spec first pass

* docs(gguf): update with review comments

* docs(gguf): update with review comments

* docs(gguf): quant version optional for unquant

* docs(gguf): normalize naming, add whisper

* docs(gguf): more review updates

* docs(gguf): add norm eps and added_tokens

* docs(gguf): move padding

* docs(gguf): remove migration tool

* docs(gguf): make offset base explicit

* docs(gguf): fix replace oops

* docs(gguf): alignment metadata+tensor name len max

* docs(gguf): clarification, fixes, tensor names

* docs(gguf): clarify license

* docs(gguf): minor tweaks

* docs(gguf): data layout, GQA eq, no ft, LE GGUF

* docs(gguf): fix magic order

* docs(gguf): match impl

* docs(gguf): specify fallback alignment

* docs(gguf): remove TensorInfo::n_elements

* docs(gguf): filetype, rope base/linear scale

* docs(gguf): v2 - uint64 all the things

* docs(gguf): tweak extensibility wording

* docs(gguf): fix spec discrepancies

* docs(gguf): v3 + other fixes

* fix(editorconfig): use 2-space tabs for markdown

* docs(gguf): clarify big-endian