Async & concurrent network startup

[gsfk]

Makes all network calls async

• main benefit is to beacon network startup, since nodes are now called concurrently
• update all tests to async
• a few releated config changes; some deprecated values were also removed

[codecov]

Codecov Report

Attention: Patch coverage is 70.06173% with 97 lines in your changes missing coverage. Please review.

Project coverage is 64.76%. Comparing base (45350d3) to head (716f776).
Report is 28 commits behind head on master.

Files with missing lines	Patch %	Lines
bento_beacon/network/utils.py	63.63%	18 Missing and 2 partials ⚠️
bento_beacon/utils/gohan_utils.py	66.66%	15 Missing ⚠️
bento_beacon/utils/handover_utils.py	40.00%	12 Missing ⚠️
bento_beacon/utils/reference.py	21.42%	11 Missing ⚠️
bento_beacon/endpoints/variants.py	10.00%	9 Missing ⚠️
bento_beacon/endpoints/individuals.py	55.55%	8 Missing ⚠️
bento_beacon/utils/katsu_utils.py	87.23%	6 Missing ⚠️
bento_beacon/utils/search.py	42.85%	4 Missing ⚠️
bento_beacon/network/network.py	66.66%	3 Missing ⚠️
bento_beacon/utils/beacon_response.py	76.92%	3 Missing ⚠️
... and 5 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #116      +/-   ##
==========================================
+ Coverage   59.14%   64.76%   +5.62%     
==========================================
  Files          25       26       +1     
  Lines        1373     1388      +15     
  Branches      158      156       -2     
==========================================
+ Hits          812      899      +87     
+ Misses        494      416      -78     
- Partials       67       73       +6     

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[davidlougheed]

one minor comment which doesn't actually need to be addressed. otherwise from my scan this looks good.