Set mode to handle readOnly and writeOnly

[kromol]

What version of Ajv you are you using?
6.6.2

What problem do you want to solve?
I want to use the same schema for request and response by leveraging readOnlyand writeOnly properties.

What do you think is the correct solution to problem?
One possible solution would be to add new configuration option mode that would set Ajv mode to either DEFAULT (like it works now) or READ(in this mode all readOnly items should be taken into account) or WRITE(should validate writeOnly stuff)

Will you be able to implement it?
Probably

[epoberezkin]

It is much easier to do with schema pre-processing step outside of ajv, when a single schema is used to construct READ, WRITE and DEFAULT schema.