First draft of relational Sysl model in arr.ai

[orlade-anz]

• Add function to transform Sysl to relational Sysl.
• Apply to integration_diagram and data_diagram to radically simplify model transforms.
• Add sequence_diagram to generate sequence diagrams.
• Fix SVG embed paths in script READMEs.

[codecov[bot]]

Codecov Report

Merging #989 into master will increase coverage by 1.19%. The diff coverage is 87.03%.

@@            Coverage Diff             @@
##           master     #989      +/-   ##
==========================================
+ Coverage   83.35%   84.54%   +1.19%     
==========================================
  Files          73       76       +3     
  Lines       10609    10559      -50     
==========================================
+ Hits         8843     8927      +84     
+ Misses       1432     1321     -111     
+ Partials      334      311      -23     

Impacted Files	Coverage Δ
pkg/pbutil/output.go	76.00% <ø> (-0.48%)	:arrow_down:
pkg/syslwrapper/app.go	93.44% <ø> (-0.05%)	:arrow_down:
pkg/syslwrapper/test_helper.go	57.89% <ø> (-1.42%)	:arrow_down:
pkg/importer/importer.go	63.15% <63.15%> (ø)
pkg/mod/gomod.go	73.68% <66.66%> (+1.27%)	:arrow_up:
pkg/mermaid/datamodeldiagram/datamodeldiagram.go	61.90% <68.42%> (+3.33%)	:arrow_up:
pkg/mod/module.go	66.66% <72.72%> (+0.95%)	:arrow_up:
pkg/parse/parse.go	85.34% <73.07%> (+1.37%)	:arrow_up:
...g/mermaid/integrationdiagram/integrationdiagram.go	83.19% <82.45%> (-1.19%)	:arrow_down:
pkg/importer/openapi.go	85.79% <85.04%> (-3.65%)	:arrow_down:
... and 26 more