rename to opensearch and dashboard

[prudhvigodithi]

Signed-off-by: Prudhvi Godithi pgodithi@amazon.com

Description

rename to opensearch and dashboard

Issues Resolved

https://github.com/opensearch-project/terraform-provider-opensearch/issues/18

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[prudhvigodithi]

Hey @phillbaker @bbarani @peterzhuamazon @serge-r can you please review this rename PR, I have done some changes in few go files and refactored the code. Thank you

[phillbaker]

I started reviewing and it mostly looks good, I'll be able to finish reviewing tomorrow.