Add support for bitbake language

[FederAndInk]

Is there an existing issue for this?

• I have searched the existing issues

What is the missing lexer?

bitbake/yocto lexer

Links to existing syntax definitions

• https://github.com/kergoth/vim-bitbake/blob/master/syntax/bitbake.vim
• https://github.com/tree-sitter-grammars/tree-sitter-bitbake
• https://github.com/sijk/pygments-bitbake

[FederAndInk]

bitbake is a kind of mix between shell and python
It uses the following extensions: .bb .bbappend .bbclass and .conf