Allow profile/explain result exported as readable text

[wey-gu]

Is your feature request related to a problem? Please describe.

Allow user to have text sharable profile/explain result, this happens a lot in user forum, who cannot have console access to their cluster.

Describe the solution you'd like
Enable export ascii table(rather than csv only) for profile/explain result.

Describe alternatives you've considered
n/a

Additional context
vesoft-inc/nebula#4794

[huaxiabuluo]

not only visualization, but also text result display supporting? text result can be read/copied by users

[wey-gu]

not only visualization, but also text result display supporting? text result can be read/copied by users

Better to have file based text result download(not as csv), for the huge output use cases this will be extremely helpful.