Add picker for executables/files about nvim-dap

[cryptomilk]

I have a first implementation here: https://git.cryptomilk.org/users/asn/dotfiles.git/tree/dot_config/nvim/lua/plugins/dap/c.lua#n51

[cryptomilk]

[cryptomilk]

I just noticed that you removed the search_path option. The Samba project has a lot of files (~50k), I don't really want to search for executables in the whole source tree, I only want to search for them in the build directory. That's why I added an option to specify it.

local cwd = vim.fn.getcwd()
local is_samba = cwd:find('samba')

local path = nil
if is_samba then
    path = cwd .. '/bin'
end

opts {
  path = path,
}

[mfussenegger]

Created #1218