Make middleware_hostname optional

[khavinshankar]

Proposed Changes

• made middleware_hostname optional in assets meta
• made necessary migrations

Associated Issue

• Fixes Can't save configuration for new HL7 Monitor assets #1135
• Fixes Unable to configure the asset  care_fe#4398

@coronasafe/code-reviewers

Merge Checklist

• Tests added/fixed
• Update docs in /docs
• Linting Complete

[sonarcloud]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
2 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov-commenter]

Codecov Report

Base: 55.66% // Head: 55.66% // No change to project coverage 👍

Coverage data is based on head (2b876b9) compared to base (e8d97be).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1136   +/-   ##
=======================================
  Coverage   55.66%   55.66%           
=======================================
  Files         177      177           
  Lines        8769     8769           
  Branches     1505     1505           
=======================================
  Hits         4881     4881           
  Misses       3836     3836           
  Partials       52       52           

Impacted Files	Coverage Δ
care/facility/models/json_schema/asset.py	100.00% <ø> (ø)

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