add support for Ingress pathType

[M00nF1sh]

Add support for Ingress pathType introduced in K8s 1.18+: https://kubernetes.io/docs/concepts/services-networking/ingress/#path-types

1. The pathType will default to be ImplementationSpecific if unspecified.
2. For ImplementationSpecific PathType:
   1. path can contain wildcards: "*" or "?"
   2. the generated path pattern will be same as path specified in IngressSpec
3. For Exact PathType:
   1. path shouldn't contains any wildcards: "*" or "?"
   2. the generated path pattern will be same as path specified in IngressSpec.
4. For Prefix PathType:
   1. path shouldn't contains any wildcards: "*" or "?"
   2. for /, the generated path pattern will be "/*"
   3. for /abc/def, the generated path pattern will be "/abc/def" and "/abc/def/*"
   4. for /abc/def/, the generated path pattern will be "/abc/def" and "/abc/def/*"

Test done:

1. unit tests
2. tested with Ingresses with path & path type defined in UTs, and observed the desired behaviors.

[codecov-io]

Codecov Report

Merging #1772 (d8a4fc7) into main (dd8f8c6) will increase coverage by 0.18%.
The diff coverage is 92.30%.

@@            Coverage Diff             @@
##             main    #1772      +/-   ##
==========================================
+ Coverage   47.14%   47.32%   +0.18%     
==========================================
  Files         110      110              
  Lines        6033     6058      +25     
==========================================
+ Hits         2844     2867      +23     
- Misses       2926     2927       +1     
- Partials      263      264       +1     

Impacted Files	Coverage Δ
pkg/ingress/model_build_listener_rules.go	44.52% <92.30%> (+9.80%)	⬆️

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[M00nF1sh]

/test pull-aws-load-balancer-controller-e2e-test

[M00nF1sh]

/test pull-aws-load-balancer-controller-e2e-test

[M00nF1sh]

/test pull-aws-load-balancer-controller-e2e-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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