feat: add completion to filter

[Ramilito]

added completion to filter
exclude namespace from filter

solves #286

[mosheavni]

very nice! any idea why it sends me to the start of the line upon completion?

[Ramilito]

hmm where are you seeing that? after filtering?

[mosheavni]

[Ramilito]

ah, that's probably vim.api.nvim_win_set_cursor(0, { #header + 2, #prompt })
We should check if cursor already is in prompt before calling that, it's supposed to help you when you select an option instead of using completion

[Ramilito]

fixed in #294