Add conditional to company-org-roam--get-candidates to check if
completion is for a roam-link or not.
If completion is for a roam-link, include in-buffer candidates for
TITLEs that are not part of the org-roam database yet
Add conditional to company-org-roam--post-completion to check if
completion is for a roam-link or not.
If completion is for a roam-link either insert plain
TITLE (completion inside [[roam:]] syntax) or insert complete roam
link (org-roam-use-roam-links is t)
For org-roam/org-roam#592
[[roam:]]syntax) or insert complete roam link (org-roam-use-roam-linksist)