View SnoopCompile flamegraph on HTML canvas

[theogf]

Closes #33

This is non-trivial MR which:

• Adds a conversion from the Flamegraph type from FlameGraphs.jl to the ProfileFrame defined here.
• Creates a package extension on SnoopCompile.jl and add the @snoop_view macro which run @snoopi_deep on an expression and returns a ProfileCanvas HTML flamegraph
• For this MR to work nicely Invisible blocks and snoopcompile flags jl-profile.js#1 is required to be merged.