fix(fuse) named/aliased imports
refactor(namesys) move proto to internal pb package
refactor(crypto/spipe) move proto to internal pb package

https://docs.google.com/document/d/1e8kOo3r51b2BWtTs_1uADIA5djfXhPT36s6eHVRIvaU/edit
refactor(crypto) move proto to internal pb package

https://docs.google.com/document/d/1e8kOo3r51b2BWtTs_1uADIA5djfXhPT36s6eHVRIvaU/edit
refactor(net/mux) move proto to internal pb package
refactor(diagnostics) move proto to internal pb package

https://docs.google.com/document/d/1e8kOo3r51b2BWtTs_1uADIA5djfXhPT36s6eHVRIvaU/edit
refactor(exchange/bitswap) move proto to internal pb package
refactor(net/service) move proto to internal pb package
refactor(merkledag) move proto to internal pb package

https://docs.google.com/document/d/1e8kOo3r51b2BWtTs_1uADIA5djfXhPT36s6eHVRIvaU/edit
refactor(unixfs) move proto to pb package

not internal since io needs it

fix(fuse/ipns) use pb package

fix(fuse) import protos from unixfs/pb package
fix(crypto) rename proto package -> crypto_pb, regen go file

+ add Makefile
fix(net/mux/pb) rename proto package -> mux_pb
fix(unixfs/pb) rename proto package -> unixfs_pb
fix(diag) rename proto package -> diagnostics_pb
fix(exch/bs/pb) rename proto package -> bitswap_message_pb
fix(crypto/spipe/pb) rename proto package -> spipe_pb
fix(namesys/pb) rename proto package -> namesys_pb
fix(merkledag/pb) rename proto package -> merkledag_pb
fix(net/service/pb) rename proto package -> service_pb
misc(exch/bitswap) add TODOs