[$50] Make some Job fields optional

[maxceem]

We would like to make the next fields in Job model optional as we don't always have them. So we would be more flexible during development.

• externalId
• description
• startDate
• endDate
• resourceType
• rateType
• workload (and remove default value)

Make them optional in:

• DB
• ES
• in all endpoints
• swagger
• create a migration script

If there are any places in code that rely on these values, please, let me know.

[maxceem]

Contest https://www.topcoder.com/challenges/30161551 has been created for this ticket.

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[maxceem]

@imcaizheng this is ready for pick up.

[maxceem]

Contest https://www.topcoder.com/challenges/30161551 has been updated - it has been assigned to aaron2017.

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[imcaizheng]

PR created #103
PR for taas-es-processor created topcoder-platform/taas-es-processor#11

[maxceem]

@nkumar-topcoder PR for this issue has been tested locally and works good.

We would need your help to merge it.

1. Merge PR make some fields of Job optional #103
2. Run migration script npm run migrate

[maxceem]

Verified on DEV, works good.

[maxceem]

Payment task has been updated: https://software.topcoder.com/review/actions/ViewProjectDetails?pid=30161551

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