Fix BPE: bring data into imagebind library

[ChrisjanWust]

Based on https://github.com/ericschreiber 's work on bringing the BPE data into the package: #112

I've added some commits to resolve merge conflicts / ignore quotation changes

From the original PR:

I (probably also others) just wanted to use this as a package. For the text embeddings to work, one needs to include the bpe tokenizer. This file was not included into the package.
This should be fixed and this package can be used out of different directories now with the standard package builds.

TL;DR: brings the BPE data into imagebind/ so that you don't have to copy that yourself manually when installing ImageBind as a library.