Catalog endpoint support for mongo (#985)

* Added new cataloger interface

* Implementing catalog protocol

* Propagated to protocol and over

* First round of fixes

* S3 almost ready, need to be tested

* Going on with testing s3

* Better testing with s3

* Simplified catalog tests

* Preparing gcp tests to access a gcp instance

* Fixing initialization errors

* Removed some prints

* Gcp ready, to be tested

* Gcp working

* Aligned bucket mock to catalog method

* Switched res payload to json

* Added catalog method to all storage instances

* Added catalog method to unsupported storages

* Fixed with pool test

* Restored tests

* Fixed gcp constructor

* Implemented catalog for fs

* Removed trace

* E2e tests, fixed fs

* Fixed module name return value

* Added cataloger method to azure storage

* Added docs

* Changed pagesize parameter name

* Fixed gofmt error

* Added json tags to result. Fixed lint warning

* Removed extra line

* Changed not implemented error to http.KindNotImplemented

* Checking for inequality on results

* Lower-cased json keys

* Added cleaning of path separator

* Fixed review comments

* Add catalog endpoint for mongo

* Add omitempty to ID

* Fix catalog tests

* update for next token

* fix e2e

* Make query readable

* Fix language and e2e script

* remove new line

config.dev.toml

@@ -198,7 +198,7 @@ StatsExporter = "prometheus"
         # Should be used for testing or development only
         # Env override: ATHENS_MONGO_INSECURE
         Insecure = false
-        
+
     [Storage.S3]
         # Region for S3 storage
         # Env override: AWS_REGION