TT-7029 Add ability to manage annotations for the MDCB and Dashboard services

[zalbiraw]

Description

This PR will allow the customers to add annotations to their services. This is required when deploying LoadBalancer types.

Related Issue

#230

Motivation and Context

Required by anyone who would like to deploy these Tyk services as LBs.

Test Coverage For This Change

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• Make sure you are requesting to pull a topic/feature/bugfix branch (right side). If PRing from your fork, don't come from your master!
• Make sure you are making a pull request against our master branch (left side). Also, it would be best if you started your change off our latest master.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[komalsukhani]

@zalbiraw Don't we need it for Gateway service?

[zalbiraw]

Yes @komalsukhani thats already in the templates actually. So we did it initially for the gateway but not the mdcb or dashboard l.