Add AWS‑ALB ingress traffic routing support

[GautamBytes]

Ⅰ. Describe what this PR does

• Extends the classType enum in the CRD to include aws-alb.

• Updates the Go API types’ documentation to mention aws-alb.

• Adds a new lua_configuration/trafficrouting_ingress/aws-alb.lua script that builds a weighted forward action with both stable and canary target groups, plus optional header/cookie/sourceIP conditions.

• Modifies the controller to pass both StableService and CanaryService into the Lua context.

• Extends unit tests (ingress_test.go) to load the new Lua script and validates the AWS‑ALB annotations JSON.

Ⅱ. Does this pull request fix one issue?

fixes #129

Ⅲ. Special notes for reviews

Verify that the Lua script produces valid AWS ALB Controller annotations.

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