Searching with invalid dkist.PageSize could handle 422 better and return details

[JimArnow-nso]

Fido.search(a.dkist.Page(page=1), a.dkist.PageSize(1001))

throws

HTTPError: HTTP Error 422: Unprocessable Entity

but does not give any details of what failed. Meanwhile, under the hood, the GET is equivalent to this direct curl:

https://api.dkistdc.nso.edu/datasets/v1?pageNumber=1&pageSize=1001&sortColumn=createDate

which returns a 422 but also includes this in the response body:

{"detail":[{"loc":["query","pageSize"],"msg":"ensure this value is less than or equal to 1000","type":"value_error.number.not_le","ctx":{"limit_value":1000}}]}

Displaying some of the details from the response could be useful to the user.

It is possible to check for possible values before making the GET, but that is dependent on adding support for the searchValues API (see #167) and adding pageSize to the list of parameter values that searchValues returns.