Add change ip functionality, update monitors logic

[dmytrotkk]

Changes

This PR adds change IP support to skale-admin.

Main 2 parts that handle change IP in any sChain on the node:

1. Config monitor that checks and compares IPs in config and on contracts and sets reload_ts to external config.
2. Skale monitor that specifically handles change IP case and sends the timestamp to skaled.

Procedure in details:

1. Config monitor collects info about current sChain nodes and passes it to checks and config action manager
2. New check was added - node_ips. It verifies that all nodes in the config are identical to skale-manager contracts.
3. If the check is False - reload_ts is calculated and saved to the external config, and a new upstream config is generated.
4. If the check is True - reload_ts is changed to None and saved.
5. Skaled montor checks external config for reload_ts, if relaod_ts is not None - ReloadIpSkaledMonitor is executed.
6. ReloadIpSkaledMonitor updates firewall rules from the upstream config and sets exit ts to rotation file for skaled.
7. The config monitor configs should be up-to-date on the next iteration, so reload_ts changed to None.

This PR also adds tests for the new functionality, including:

1. Config monitor case with change IP.
2. New skaled monitor test.

Performance

• No performance related changes were made.

Testing

• Modified existing and added new unit tests.
• Verified on local network by executing changeIP transaction.

Fixes #832

[codecov]

Codecov Report

Attention: 24 lines in your changes are missing coverage. Please review.

Comparison is base (6b2e975) 81.14% compared to head (280b4a8) 81.43%.
Report is 2 commits behind head on v2.6.x.

Files	Patch %	Lines
core/schains/monitor/skaled_monitor.py	52.00%	12 Missing ⚠️
core/node.py	86.15%	9 Missing ⚠️
core/schains/monitor/action.py	92.00%	2 Missing ⚠️
core/schains/monitor/main.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           v2.6.x    #1035      +/-   ##
==========================================
+ Coverage   81.14%   81.43%   +0.28%     
==========================================
  Files         101      101              
  Lines        5596     5709     +113     
==========================================
+ Hits         4541     4649     +108     
- Misses       1055     1060       +5     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.