Add "examples" to allowed Meta

[bensaufley]

Based on the ajv docs it looks like examples, which already exists on BaseSchema, should be allowable as a meta property. I don't see any other references to examples anywhere in the package – please lmk if I've missed something and I should just use some other means of setting examples

[vitalics]

@bensaufley thanks for MR. Could you also add tests for output schema? or will it be okay to handle it on my end?

[bensaufley]

@vitalics I'm happy to take a look tonight - I don't see any other meta tests so I'm not sure what pattern to follow here, but I can obviously put something together. But you're welcome to handle it on your end as well. FWIW I did two "tests" locally to confirm expected behavior:

1.  npx node -e "console.log(require('ajv-ts').s.object().meta({ examples: ['foo'] }).schema)"
    #=> { type: 'object', properties: {}, examples: [ 'foo' ] }

2. Went into my node_modules in the project that uses this library (https://github.com/bensaufley/audiobook-catalog) and manually added this change; checked that typechecking in my project now passed

[vitalics]

will closed in #66

[bensaufley]

Thanks!