feat: renamed config options with prefixes; added aliases for old names

* secret-is-base64 -> jwt-secret-is-base64
* role-claim-key -> jwt-role-claim-key
* max-rows -> db-max-rows
* pre-request -> db-pre-request
* root-spec -> db-root-spec
* db-schema -> db-schemas

This is not a breaking change, because aliases are added as well.

refactor: sorted all config keys alphabetically where applicable

test/io-tests/configs/aliases.config

@@ -0,0 +1,9 @@
+db-anon-role = "required"
+db-uri = "required"
+
+db-schema = "provided_through_alias"
+max-rows = 1000
+pre-request = "check_alias"
+role-claim-key = ".aliased"
+root-spec = "open_alias"
+secret-is-base64 = true