[FEA] Improve escape character and quotation character parsing in Json and CSV reader.

[rgsl888prabhu]

Is your feature request related to a problem? Please describe.
As of now, csv and json reader are post processing occurrences of escape character and quotation character once it parses complete string.

cudf/cpp/src/io/csv/reader_impl.cu

Line 375 in 76e2e15

out_columns.emplace_back(

Describe the solution you'd like
We might be able to handle skipping/leaving those character while copying the data.

[harrism]

Can you clarify the title of this issue to indicate which cuIO reader and writer?

[github-actions]

This issue has been marked rotten due to no recent activity in the past 90d. Please close this issue if no further response or action is needed. Otherwise, please respond with a comment indicating any updates or changes to the original issue and/or confirm this issue still needs to be addressed.

[karthikeyann]

This issue is not relevant for JSON reader anymore. JSON reader string processing performance escape characters and also utf8 decoding properly. if CSV reader does not have this issue, this issue can be closed.