Verbose and succinct cache output about xds-relay HOT 3 OPEN

How about using query params for the verbose cache option, ex: /cache/<key>?verbose=true

from xds-relay.

The succinct cache output looks good, except I would return the full response rather than just the typeURL/version. What are your thoughts? cc @jyotimahapatra

from xds-relay.

@jyotimahapatra @jessicayuen, what do you think of this?
Verbose/succinct setup:
Split cache handler into two:

When /verbose_cache/key* flag is used, we run the existing cache flow to output the entire cache.
When /cache/key* flag is excluded, the cache output becomes a summary as follows:

Cache: [
	{
                "aggkey": string,
		"resp_typeURL”: string,
		"resp_version”: int,
		"num_requests: int,
		"exp_time”: string
	}
]