add multi-like filter (mlike)

[gipsh]

• mlike filter allows to search using like in many fields
• example http://localhost:3000/?filters=["name,summart,title","mlike","john"]

SELECT * FROM user WHERE name LIKE '%john%' OR summary LIKE '%john%' OR title LIKE '%john%'  LIMIT 10 OFFSET 0

• you can achieve same behaviour chaining many likes but the filter strings grows too much

[morkid]

very interesting. I think this is a smart proposal.
may i merge yours into like, not like, ilike and not ilike operators?
this will be the default behavior, but I might add some changes. thanks

[morkid]

PR #18