Verbose and succinct cache output

[jyotimahapatra]

While debugging caches i realized the cache output is too big because it includes the DiscoveryRequest.
This was hard to work with. We should make a way to show verbose/non verbose logs on cache endpoint.

[samrabelachew]

@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
	}
]

[jessicayuen]

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

[jessicayuen]

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