Fixes: #1298 - Add SnipeIT source

[chandanchowdhury]

Summary

Adding new intel module for SnipeIT source.

Related issues

#1298

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Read through our developer docs

• [x] PR Title starts with "Fixes: [issue number]"

If you are modifying or implementing a new intel module

• [x] Update the schema and readme
• [x] Use our NodeSchema data model
• [x] Use specialized functions get_, transform_, load_, and cleanup_ functions
• [x] Add tests
  • [x] Unit tests: Test your transform_ function with sample data (Not applicable)
  • Integration tests
    • [x] Use our test helper functions
    • [x] Test a cleanup job

[chandanchowdhury]

Review request

@achantavy