Added client-level REST helpers.

[dblock]

Description

Adds client-level REST helpers.

This allows one to do client.http.get(...), .post, etc., instead of client.transport.perform_request("GET", ...).

Issues Resolved

Closes https://github.com/opensearch-project/opensearch-py/issues/498.

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[codecov[bot]]

Codecov Report

Merging #544 (06a59dd) into main (f02d6de) will increase coverage by 0.12%. Report is 1 commits behind head on main. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #544      +/-   ##
==========================================
+ Coverage   71.74%   71.87%   +0.12%     
==========================================
  Files          87       89       +2     
  Lines        7886     7922      +36     
==========================================
+ Hits         5658     5694      +36     
  Misses       2228     2228              

Files	Coverage Δ
opensearchpy/_async/client/__init__.py	46.18% <100.00%> (+0.39%)	:arrow_up:
opensearchpy/_async/client/http.py	100.00% <100.00%> (ø)
opensearchpy/client/__init__.py	61.45% <100.00%> (+0.28%)	:arrow_up:
opensearchpy/client/http.py	100.00% <100.00%> (ø)

[dblock]

@saimedhi @harshavamsi @Xtansia wdyt?

[Xtansia]

@saimedhi @harshavamsi @Xtansia wdyt?

We're going to have this name clash with get in all the clients presumably, and it'd probably be nice to have this semi-standardised across them. An option is to make an "operation namespace" like raw or http same as we have cat/cluster/indices etc.

[dblock]

@Xtansia What's your most preferred option for client.X.Y.Z?

[Xtansia]

@Xtansia What's your most preferred option for client.X.Y.Z?

I personally feel like client.http.get() is probably the most self-documenting, and least likely to ever conflict with the naming of a "real" operation

[dblock]

Followed suggestion from @Xtansia to make the code client.http.get, client.http.post, etc. This is ready to review!