Search improvements, search for multiple terms

Discussion here: https://discourse.nodered.org/t/search-feature-improvements/101792/9

Proposal to allow for multiple search terms. (AND)

This would allow users to search for nodes that contain more than one string

Example: a change node that sets topic to "motion" and payload to "outside"

We can not search for this in the editor the way it is today. Proposal is to show the example node when typing "outside motion" in the search field

The search string would have to be split and multiple searches performed. Those that match the entire string in one go could end up first. Those that match all "words" could end up right bellow.

OR

Use a fixed string to indicate that the search field should be split. Users wil not have to remeber this string since it could be selected in the list, see image bellow. Option to use "AND" or the string "and:also". it is wery unlikley that a user will search for " and:also "