Cache network settings

[smallhive]

Closes #247.

[codecov]

Codecov Report

Attention: Patch coverage is 35.71429% with 36 lines in your changes missing coverage. Please review.

Project coverage is 23.61%. Comparing base (02e0776) to head (309119b).
Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
handlers/auth.go	0.00%	10 Missing ⚠️
handlers/containers.go	0.00%	9 Missing ⚠️
internal/cache/networkinfo.go	74.07%	6 Missing and 1 partial ⚠️
handlers/util.go	0.00%	4 Missing ⚠️
handlers/network.go	0.00%	2 Missing ⚠️
handlers/objects.go	0.00%	2 Missing ⚠️
handlers/api.go	0.00%	1 Missing ⚠️
handlers/newObjects.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #251      +/-   ##
==========================================
+ Coverage   22.79%   23.61%   +0.81%     
==========================================
  Files          18       19       +1     
  Lines        3672     4731    +1059     
==========================================
+ Hits          837     1117     +280     
- Misses       2677     3455     +778     
- Partials      158      159       +1     

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[roman-khimov]

Do we have any other places where network info is used? Can they reuse this cache?

[roman-khimov]

Please also update getEpochDurations and getCurrentEpoch.

[roman-khimov]

In general it's OK, but now some tests fail here: https://rest.fs.neo.org/7ZVSQHtioVRiDT2btN9xEmQhczXV9vryCEAHUawfD8Sc/141-1729604693/index.html#suites/21ade783424f8b7f50534d1bb781c71b/2824020f8d392ae/

@evgeniiz321, is there any forced epoch tick there? Can they be fixed to handle cached epochs?