feat(copilot-lua-cmp): add blink.cmp support

[azdanov]

📑 Description

This should hopefully add similar copilot support to blink as it was for cmp. Not sure if it's 1 to 1, since I'm not familiar with either of them 🙈

ℹ Additional Information

I've checked https://cmp.saghen.dev/configuration/keymap.html#example and copied Tab from main community pack.

[github-actions]

Review Checklist

Does this PR follow the [Contribution Guidelines](development guidelines)? Following is a partial checklist:

Proper conventional commit scoping:

• If you are adding a new plugin, the scope would be the name of the category it is being added into. ex. feat(utility): added noice.nvim plugin

• If you are modifying a pre-existing plugin or pack, the scope would be the name of the plugin folder. ex. fix(noice-nvim): fix LSP handler error

• Pull request title has the appropriate conventional commit type and scope where the scope is the name of the pre-existing directory in the project as described above

• README is properly formatted and uses fenced in links with <url> unless they are inside a [title](url)

• Entry returns a single plugin spec with the new plugin as the only top level spec (not applicable for recipes or packs).

• Proper usage of opts table rather than setting things up with the config function.

• Proper usage of specs table for all specs that are not dependencies of a given plugin (not applicable for recipes or packs).

[mehalter]

Could you update the README? I'll merge this in after

[mehalter]

@azdanov you should revert the lowercase stuff. They should be uppercase.We should normalize all mappings on official keycodes.

[mehalter]

LGTM

[jay-babu]

Is it better to use this or the community sources from https://cmp.saghen.dev/configuration/sources#community-sources for copilot?