[MP restserver] Add type=my handler to /items API

[SwordFaith]

Introduction

To support sidebar "my" filter in webportal and save job to marketplace in pai. #210 work item 3

Issues / Motivations

To support sidebar "my fileter in webportal save job to marketplace in pai.

Proposals / Solutions

Internally convert to author == username filter query

Work Plan

• Add converter to filter author == username

Demo

Test cases

• Can filter all author == username items

[SwordFaith]

Change to author=username request for "My" side bar, so no need to add this format query