refactor imports and fix oxo should exit once the scan has completed

[elyousfi5]

Test approach:

built an agent and tried to import some modules that were failing before:

built some agents (nmap, autoscaler, virustotal) with this version of oxo and ran scan with them:

AgentGroup:

name: test_oxo
kind: AgentGroup
description: Agent group definition for oxo testing.
agents:
  - args: [ ]
    key: agent/dev/nmap
  - args: [ ]
    key: agent/dev/virustotal
  - args: [ ]
    key: agent/dev/autoscaler

Logs of agents:

[codecov]

Codecov Report

Attention: Patch coverage is 84.72222% with 11 lines in your changes missing coverage. Please review.

Project coverage is 80.33%. Comparing base (8205b10) to head (bfdba32).
Report is 13 commits behind head on main.

Files	Patch %	Lines
src/ostorlab/main.py	0.00%	10 Missing ⚠️
src/ostorlab/runtimes/local/log_streamer.py	90.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #783       +/-   ##
===========================================
+ Coverage   62.63%   80.33%   +17.69%     
===========================================
  Files         341      340        -1     
  Lines       14153    14141       -12     
===========================================
+ Hits         8865    11360     +2495     
+ Misses       5288     2781     -2507     

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[oussamaessaji]

New line

[oussamaessaji]

Apply for the rest