Document AWS Lambda permissions

[tsotnet]

Signed-off-by: Tsotne Tabidze tsotne@tecton.ai

What this PR does / why we need it: Documents necessary AWS permissions for the aws lambda feature server deployment to work.

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[codecov-commenter]

Codecov Report

Merging #1970 (c50026b) into master (6728f2a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1970   +/-   ##
=======================================
  Coverage   82.07%   82.07%           
=======================================
  Files         100      100           
  Lines        7987     7987           
=======================================
  Hits         6555     6555           
  Misses       1432     1432           

Flag	Coverage Δ
integrationtests	74.45% <ø> (ø)
unittests	59.28% <ø> (ø)

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[achals]

/lgtm

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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