feat(graphql): Added datafetcher for DataPlatformInstance entity

[siladitya2]

This PR contains below mentioned changes:

1. Added graphql datafetcher for DataPlatformInstance
2. Added support for AutoCompletion(autoCompleteForMultiple) of DataPlatformInstanceType.
   The AutoCompletion of DataPlatformInstance will work only if the DATA_PLATFORM_INSTANCE provided on the types of autoCompleteForMultiple query.
   Example:

"input": {
      "query": "big",
      "limit": 10,
      "filters": [],
      "types": ["DATA_PLATFORM_INSTANCE","DATASET"]
    }

We do here the same as searchAcrossEntities, where also DataPlatformInstance will be searched only if DATA_PLATFORM_INSTANCE is included in the types of the query

Checklist

• The PR conforms to DataHub's Contributing Guideline (particularly Commit Message Format)
• Links to related issues (if applicable)
• Tests for the changes have been added/updated (if applicable)
• Docs related to the changes have been added/updated (if applicable). If a new feature has been added a Usage Guide has been added for the same.
• For any breaking change/potential downtime/deprecation/big changes an entry has been made in Updating DataHub

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