Improve filtered search components

search_term.

• make it possible to use spaces
• spacing/kerning between words in search_term is too wide (when the individual word gets tokenized).
• when term is entered, a box should appear that says [mag-glass icon] Search this text (check with UX).

filtered_search

• token dropdowns never stop showing up and don't allow users to type

General

• Add documentation - needs more examples, especially an implementation example with just search token with free text.

suggestion.

• When using the component in GitLab, some padding gets added to the item, which makes it appear wider: