Handle schain storage allocation type

[badrogger]

Changes

• Handle new allocation type schain options field.

Tests

• Tested on local network.
• Modified existing unit tests. Added new ones.

Performance

• No performance related changes were introduced.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 86.13861% with 14 lines in your changes missing coverage. Please review.

Project coverage is 81.84%. Comparing base (e73dc2f) to head (891e4dc). Report is 36 commits behind head on v2.8.x.

Files with missing lines	Patch %	Lines
core/schains/process_manager.py	0.00%	5 Missing :warning:
core/schains/monitor/main.py	60.00%	2 Missing :warning:
core/schains/process_manager_helper.py	0.00%	2 Missing :warning:
core/schains/volume.py	71.42%	2 Missing :warning:
core/schains/config/generator.py	94.11%	1 Missing :warning:
core/schains/monitor/containers.py	93.75%	1 Missing :warning:
core/schains/monitor/rpc.py	90.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## v2.8.x #1101 +/- ## ========================================== + Coverage 81.81% 81.84% +0.02% ========================================== Files 102 102 Lines 6060 6069 +9 ========================================== + Hits 4958 4967 +9 Misses 1102 1102 ```

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