Remove lua-resty-waf feature

[aledbf]

What this PR does / why we need it:

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

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Codecov Report

❗ No coverage uploaded for pull request base (master@9f72cb3). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master    #4779   +/-   ##
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  Coverage          ?   58.72%           
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  Files             ?       88           
  Lines             ?     6770           
  Branches          ?        0           
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  Hits              ?     3976           
  Misses            ?     2363           
  Partials          ?      431

Impacted Files	Coverage Δ
internal/ingress/annotations/annotations.go	80.45% <ø> (ø)
internal/ingress/controller/controller.go	51.56% <ø> (ø)
internal/ingress/types_equals.go	17.49% <ø> (ø)
internal/ingress/types.go	0% <ø> (ø)
internal/ingress/controller/template/template.go	80.24% <100%> (ø)

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[imjching]

Out of curiosity, is there a reason why we plan to remove this feature? @aledbf

[cmluciano]

/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aledbf, cmluciano

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[vietwow]

@aledbf the same question as @imjching , could you please to share reason why we remove this feature ? Thanks

[aledbf]

@vietwow @imjching the main reasons are related to issues building the image, the project not being active, and also it was not possible to use it in ARM.

[imjching]

I guess we could easily put this back in through the custom plugin system if we really want this feature.

[vietwow]

@imjching ingress-nginx have custom plugin system ?

[imjching]

@vietwow Yes, it was merged in #3807. It seems like it is still an MVP system, but it works.