Feature/solr datasource

[varadekd]

• Issue: [Link to the issue. Do not use any of the github automation keywords]
  SOLR datasource #34

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Enter a brief description of the PR contents here

We have enable edges to support Solr based query. User will be making the queries in ES format (similar to elastic search) the edges then will internally convert this to the Solr format. This PR can be considered as an Alpha release of the edges for Solr.

NOTE

1. You will need to import Solr data source when working with Solr queries.
2. Ensure that no other data source is been imported.

Developer Checklist

Developers should review and confirm each of these items before requesting review

• Code meets acceptance criteria from issue
• Sufficient testing has been carried out
• Project's coding standards are met link
• Code documentation and related non-code documentation has all been updated

Reviewer Checklist

Reviewers should review and confirm each of these items before approval
If there are multiple reviewers, this section can be duplicated for each reviewer

• Code meets acceptance criteria from issue
• Sufficient testing has been carried out
• Project's coding standards are met link
• Code documentation and related non-code documentation has all been updated

Testing

List testing requirements/procedures

[varadekd]

@richard-jones Please review the PR