feat: support json print in loginfo

[cristianmtr]

I found this more useful when debugging. I can just copy-paste the output into a JSON tree viewer, and collapse/expand as needed during inspection.

[codecov]

Codecov Report

Merging #1693 (688e57b) into master (5530733) will increase coverage by 0.85%.
The diff coverage is 78.50%.

@@            Coverage Diff             @@
##           master    #1693      +/-   ##
==========================================
+ Coverage   84.20%   85.05%   +0.85%     
==========================================
  Files         132      133       +1     
  Lines        6830     6827       -3     
==========================================
+ Hits         5751     5807      +56     
+ Misses       1079     1020      -59     

Impacted Files	Coverage Δ
jina/docker/checker.py	84.90% <ø> (+2.76%)	⬆️
jina/docker/hubio.py	70.27% <74.35%> (+7.00%)	⬆️
jina/docker/hubapi/remote.py	75.32% <75.32%> (ø)
jina/parsers/hub/__init__.py	65.00% <80.00%> (-0.12%)	⬇️
jina/docker/hubapi/local.py	81.70% <81.70%> (ø)
jina/drivers/control.py	95.08% <85.71%> (-1.35%)	⬇️
jina/drivers/search.py	94.82% <100.00%> (+0.18%)	⬆️
jina/parsers/hub/login.py	100.00% <100.00%> (ø)
... and 2 more

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[github-actions]

Latency summary

Current PR yields:

• 😶 index QPS at 1646, delta to last 3 avg.: -2%
• 😶 query QPS at 33, delta to last 3 avg.: +1%

Breakdown

Version	Index QPS	Query QPS
current	1646	33
0.9.13	1671	31
0.9.12	1714	32

Backed by latency-tracking. Further commits will update this comment.