Add opensearch module

[lewismc]

Pull request to add a new opensearch module.

[lewismc]

Relates to https://github.com/opensearch-project/OpenSearch/issues/2603

[codecov-commenter]

Codecov Report

Merging #225 (0cae8ae) into master (24e1393) will decrease coverage by 2.89%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #225      +/-   ##
==========================================
- Coverage   86.60%   83.71%   -2.90%     
==========================================
  Files          27       28       +1     
  Lines         724      749      +25     
  Branches       65       67       +2     
==========================================
  Hits          627      627              
- Misses         76      101      +25     
  Partials       21       21              

Impacted Files	Coverage Δ
testcontainers/opensearch.py	0.00% <0.00%> (ø)

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[tillahoffmann]

Closed by #276. Sorry we didn't merge this one. #276 had more extensive tests and added functionality regarding security. Thank you for the contribution!