Please add "script-friendly output" flag to rekkor-cli

[udf2457]

At present, rekor-cli is too verbose to be used in scripts becasue it produces too much extraneous output, even with --format json set, for example:

./go/bin/rekor-cli search --sha $(openssl dgst -sha256 blob | awk '{print $NF}') --format json
Found matching entries (listed by UUID):
{"UUIDs":["somehexgoeshere"]}

There should be way to output the relevant output only, i.e. no "Found matching entries (listed by UUID):" line.

Its the same with rekor-cli get, which outputs extraneous header lines and hides the actual json behind Body::

LogID: foo
Index: bar
IntegratedTime: 2023-01-01T01:01:01Z
UUID: foobar
Body: