Support configuring SDLC instance

[akphi]

Q	A
Fixed issues?
Tests added + passed?	Yes
Changeset added?	Yes
Documentation PR link
Any dependency changes?	No

[changeset-bot]

🦋 Changeset detected

Latest commit: e066465

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 6 packages

Name	Type
@finos/legend-studio	Patch
@finos/legend-studio-app	Patch
@finos/legend-studio-plugin-management	Patch
@finos/legend-studio-plugin-tracer-zipkin	Patch
@finos/legend-studio-preset-dsl-text	Patch
@finos/legend-studio-preset-external-format-json-schema	Patch

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Click here if you're a maintainer who wants to add another changeset to this PR

[codecov]

Codecov Report

Merging #147 (e066465) into master (e9d2f4b) will increase coverage by 0.03%.
The diff coverage is 77.50%.

@@            Coverage Diff             @@
##           master     #147      +/-   ##
==========================================
+ Coverage   45.46%   45.50%   +0.03%     
==========================================
  Files         648      648              
  Lines       29675    29707      +32     
  Branches     6705     6651      -54     
==========================================
+ Hits        13491    13517      +26     
- Misses      16137    16143       +6     
  Partials       47       47              

Impacted Files	Coverage Δ
...ackages/legend-studio/src/stores/StoreTestUtils.ts	88.46% <ø> (ø)
...ages/legend-studio/src/stores/ApplicationConfig.ts	86.00% <68.75%> (-8.45%)	⬇️
packages/legend-studio/src/components/App.tsx	73.68% <78.94%> (+12.81%)	⬆️
.../legend-studio/src/components/shared/AppHeader.tsx	100.00% <100.00%> (ø)

[akphi]

This addresses several points in #100