Fix internal server error when trying to filter a field that's not allowed

[unnawut]

Closes #505

Overview

This PR fixes the internal server error that is returned when attempting to filter records with a field that's not allowed.

This PR is based on the changes in #501 so it's based out of #501 until merged.

Changes

• Handles when {:error, :not_allowed, field} is returned by the parser in EWallet.Web.Orchestrator

Implementation Details

N/A

Usage

curl 10.5.10.10:4000/api/admin/transaction.all -H "Accept: application/vnd.omisego.v1+json" -H "Authorization: OMGAdmin <truncated>" -H "Content-Type: application/json" -d '{
  "match_all": [
    {
      "comparator": "eq",
      "field": "1232131",
      "value": true
    }
  ],
  "page": 1,
  "per_page": 10,
  "sort_by": "name",
  "sort_dir": "asc"
}' -v -w "\n"

Should now return a client:invalid_parameter error rather than an internal_server_error error.

Impact

No DB or API changes.