Tapis CLI commands seems slower than their Bash analogues

[mwvaughn]

Describe the bug
Several Tapis CLI commands appear take longer to run (or return a response) than their Bash analogues. See the table below. Times are in seconds and are the aggregate of 5 measurements.

Command	Tapis CLI	Bash CLI
apps-list -l 10	1.56+/-0.22	0.54+/-0.08
systems-list -l 10	1.42+/-0.05	0.45+/-0.13
jobs-list -l 10	2.03+/-0.05	0.95+/-0.09
metadata-list -l 10	1.33+/-0.07	0.43+/-0.09

[mwvaughn]

There are a couple of potential sources of overhead. First, Tapis CLI proactively refreshes its token on startup. Second, it is using the built-in Python JSON parser, which may be slower than either jq or the custom JSON parser written in Bash.

It should be possible to test the first possibility by passing a pre-created token via --token which bypasses the refresh. It might be possible to test the second by replacing the built-in JSON parser with a known more performant alternative.