@jsii/spec should use AJV standalone

[mrgrain]

Describe the feature

@jsii/spec should be a zero dependency package

Use Case

Limit the amount of external dependencies. Plus we sometimes run into complex dependency resolution issues with ajv.

Proposed Solution

https://ajv.js.org/standalone.html

Other Information

No response

Acknowledgements

• [ ] I may be able to implement this feature request
• [ ] This feature might incur a breaking change

CDK version used

anmy

Environment details (OS name and version, etc.)

any

[sebs]

this is a rather good idea.