Add support for advanced flow.json service key types

[jribbink]

Closes #234

Description

Adds supports for advanced keys in flow.json

For contributor use:

• Targeted PR against master branch
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• Code follows the standards mentioned here
• Updated relevant documentation
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

[changeset-bot]

🦋 Changeset detected

Latest commit: 549375a

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

This PR includes changesets to release 1 package

Name	Type
@onflow/flow-js-testing	Minor

Not sure what this means? Click here to learn what changesets are.

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

[github-actions]

Dependency Testbed

• Flow CLI: v1.18.0-cadence-v1.0.0-preview.24
• FCL: 1.3.2

Release Version

The package containing these changes will be released with version 0.6.0-stable-cadence.3

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟢	Statements	90.14% (-1.78% 🔻)	658/730
🟡	Branches	71.53% (-3.19% 🔻)	206/288
🟢	Functions	92.31% (-0.5% 🔻)	132/143
🟢	Lines	90.83% (-1.6% 🔻)	634/698

Show new covered files 🐣

St.❔	File	Statements	Branches	Functions	Lines
🟢	flow-config.js	75%	50%	83.33%	80.95%

Show files with reduced coverage 🔻

St.❔	File	Statements	Branches	Functions	Lines
🟡	init.js	60.87% (-39.13% 🔻)	52.63% (-47.37% 🔻)	100%	60.87% (-39.13% 🔻)

Test suite run success

110 tests passing in 14 suites.

Report generated by 🧪jest coverage report action from 549375a