PUBDEV-6992: Deprecated Frame.find(Vec) and Frame.find(Key) (#3995)
PUBDEV-6992: Deprecated Frame.find(Vec) and Frame.find(Key) (#3995)

* PUBDEV-6992: Deprecated Frame.find(Vec) and Frame.find(Key)

* PUBDEV-6992: Added suggestion to use find(String)

h2oai/h2o-3,michalkurka/h2o-3,h2oai/h2o-3,michalkurka/h2o-3,h2oai/h2o-3,michalkurka/h2o-3,michalkurka/h2o-3,michalkurka/h2o-3,h2oai/h2o-3,h2oai/h2o-3,h2oai/h2o-3,h2oai/h2o-3,michalkurka/h2o-3,michalkurka/h2o-3,h2oai/h2o-3