Feature Request: Allow/Deny fields to be submitted

[unusualbob]

It would be nice to be able to allow/deny fields to be included in xray events based on options on schemas.

For example, it would be nice to be able to log queries, without logging PII or secret fields.

Something like:

const UserSchema = new Schema({
  accountType: {
    type: String,
    enum: ['a, 'b', 'c', 'd'],
    validators: ...
  },
  firstName: {
    type: String,
    lowercase: true,
    validators: ...,
    xrayAllowed: false
  },
  lastName: {
    type: String,
    lowercase: true,
    validators: ...,
    xrayAllowed: false
  },
  loginCount: {
    type: Number,
    validators: ...
  },
});

Or whitelist version:

const UserSchema = new Schema({
  accountType: {
    type: String,
    enum: ['a, 'b', 'c', 'd'],
    validators: ...,
    xrayAllowed: true
  },
  firstName: {
    type: String,
    lowercase: true,
    validators: ...
  },
  lastName: {
    type: String,
    lowercase: true,
    validators: ...
  },
  loginCount: {
    type: Number,
    validators: ...,
    xrayAllowed: true
  },
});

A query or update output would be something like:

{
  accountType: {
   $in: ['a', 'b']
  },
  firstName: {
    $in: ['xraySanitized', 'xraySanitized']
  },
  loginCount: {
    $gt: 1
  }
}