CP-827 Add line-length option to format task.

[evanweible-wf]

Issue

• Add option to format task to set max line length #14

Changes

Source:

• Add option to configure line length for dart formatter

Tests:

• n/a

Areas of Regression

• default usage of dart_dev format task

Testing

• ddev format --check should find no necessary changes
• ddev format --check -l 150 should find quite a few necessary changes

Code Review

@trentgrover-wf
@maxwellpeterson-wf
@dustinlessard-wf
fyi: @jayudey-wf

[maxwellpeterson-wf]

+1 :)

[trentgrover-wf]

+1
@jayudey-wf ready for merge

[jayudey-wf]

QA Resource Approval: +10

• Testing instruction
• Dev +1's
• Dev/QA +10 with detail of what was tested
  • verified that line length was being properly applied during format task and that default usage remained un-affected
• Unit test created/updated
• All unit tests pass

Merging into master.