Support for text glyph hit testing (#8083)
Support for text glyph hit testing (#8083)

* initial commit to support for text glyph hit testing

* corrected point rotation for multi line text

dennisobrien/bokeh,bokeh/bokeh,bokeh/bokeh,bokeh/bokeh,jakirkham/bokeh,dennisobrien/bokeh,timsnyder/bokeh,mindriot101/bokeh,stonebig/bokeh,mindriot101/bokeh,jakirkham/bokeh,dennisobrien/bokeh,ericmjl/bokeh,timsnyder/bokeh,stonebig/bokeh,timsnyder/bokeh,stonebig/bokeh,mindriot101/bokeh,dennisobrien/bokeh,ericmjl/bokeh,jakirkham/bokeh,jakirkham/bokeh,mindriot101/bokeh,stonebig/bokeh,bokeh/bokeh,timsnyder/bokeh,timsnyder/bokeh,ericmjl/bokeh,ericmjl/bokeh,dennisobrien/bokeh,ericmjl/bokeh,bokeh/bokeh,jakirkham/bokeh