Add aws-load-balancer-controller Helm chart

[fawadkhaliq]

Issue
#2087

Description
Helm chart is the preferred way of packaging and installing the AWS Load Balancer controller. Not having the chart source code in the aws-load-balancer-controller repo leads to reactive/post-merge/post-release/manual validation of the chart. We would like maintain the charts in the controller repo and sync with the eks-charts on releases (controller release or just a Helm chart release). This will also allow us to 1) test helm charts in integration and end to end tests 2) avoid the need to manually copy over CRD changes

This PR adds the AWS Load Balancer controller Helm chart. Next, we will add scripts to sync Helm charts with eks-charts on release and migrate the existing integration tests to setup controller using Helm instead

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[fawadkhaliq]

/assign @M00nF1sh

[M00nF1sh]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fawadkhaliq, M00nF1sh

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[M00nF1sh]

/lgtm

[codecov-commenter]

Codecov Report

Merging #2088 (e5c3eae) into main (9bbb027) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2088   +/-   ##
=======================================
  Coverage   49.23%   49.23%           
=======================================
  Files         130      130           
  Lines        7036     7036           
=======================================
  Hits         3464     3464           
  Misses       3294     3294           
  Partials      278      278           

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