QueryParams should be a real class with correct parsing & serialization

[jmarantz]

Description:

QueryParams are just a map, but there's no central control or testing of parsing, serialization, escaping, etc.

See TODO in https://github.com/envoyproxy/envoy/blob/master/include/envoy/http/query_params.h

This may help ultimately with #2098 , though I personally don't understand the context for that particular enhancement request.

@rotan96 may look at this.

[stale]

This issue has been automatically marked as stale because it has not had activity in the last 30 days. It will be closed in the next 7 days unless it is tagged "help wanted" or other activity occurs. Thank you for your contributions.

[rotan96]

Hi stale bot I am working on this (how do I un-stale this)

[stale]

This issue has been automatically marked as stale because it has not had activity in the last 30 days. It will be closed in the next 7 days unless it is tagged "help wanted" or other activity occurs. Thank you for your contributions.

[stale]

This issue has been automatically closed because it has not had activity in the last 37 days. If this issue is still valid, please ping a maintainer and ask them to label it as "help wanted". Thank you for your contributions.