feat(editors): change all private keyword to protected for extensability

[ghiscoding]

• also changed all services to readonly

[codecov]

Codecov Report

Merging #247 (5bec450) into master (52cc702) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #247   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          207       207           
  Lines        11979     11979           
  Branches      4115      4115           
=========================================
  Hits         11979     11979           

Impacted Files	Coverage Δ
packages/common/src/editors/autoCompleteEditor.ts	100.00% <100.00%> (ø)
packages/common/src/editors/checkboxEditor.ts	100.00% <100.00%> (ø)
packages/common/src/editors/dateEditor.ts	100.00% <100.00%> (ø)
packages/common/src/editors/dualInputEditor.ts	100.00% <100.00%> (ø)
packages/common/src/editors/floatEditor.ts	100.00% <100.00%> (ø)
packages/common/src/editors/integerEditor.ts	100.00% <100.00%> (ø)
packages/common/src/editors/longTextEditor.ts	100.00% <100.00%> (ø)
...ackages/common/src/editors/multipleSelectEditor.ts	100.00% <100.00%> (ø)
packages/common/src/editors/selectEditor.ts	100.00% <100.00%> (ø)
packages/common/src/editors/singleSelectEditor.ts	100.00% <100.00%> (ø)
... and 5 more

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