Add more context to CLI error messages

[gadomski]

Related Issue(s):

• Closes Hard-to-understand error messages from the CLI #130

Description:

Here's the error message with pystac==1.7.3:

$ stac-client collections landing-page-with-invalid-collection.json
ERROR: JSON does not represent a STAC object.
The client at /Users/gadomski/Code/stac-utils/pystac-client/tests/data/landing-page-with-invalid-collection.json is OK, but one or more of the collections is invalid.

And with pystac at main (soon to be v1.8):

$ stac-client collections tests/data/landing-page-with-invalid-collection.json
ERROR: JSON (id = invalid-collection) does not represent a STACObject instance. 'type' attribute is collection
The client at /Users/gadomski/Code/stac-utils/pystac-client/tests/data/landing-page-with-invalid-collection.json is OK, but one or more of the collections is invalid.

PR Checklist:

• Code is formatted
• Tests pass
• Changes are added to the CHANGELOG