feat: add 15 auto-test functions + destroy-test + versioning rules

Batch 1: ok, echo, error, cpu, slow
Batch 2: jsonout, recurse, bigdata, math, timestamp
Batch 3: multiline, encoding, nested, memory, chain
Tests: create, update (code_hash), idempotency, destroy, re-create
All 15 functions verified via curl with JWT auth

examples/destroy-test/code/main.py

@@ -0,0 +1,2 @@
+def main():
+    return "destroy-test-alive"

examples/destroy-test/main.tf

@@ -0,0 +1,39 @@
+terraform {
+  required_providers {
+    fission = {
+      source  = "nail/fission"
+      version = "~> 0.1.0"
+    }
+  }
+}
+
+provider "fission" {
+  kubeconfig_path = "/home/naeel/.kube/config"
+  namespace       = "default"
+}
+
+resource "fission_environment" "python" {
+  name    = "tf-destroy-test-env"
+  image   = "ghcr.io/fission/python-env"
+  version = 3
+}
+
+resource "fission_package" "pkg" {
+  name        = "tf-destroy-test-pkg"
+  environment = fission_environment.python.name
+  source_dir  = "${path.module}/code"
+}
+
+resource "fission_function" "fn" {
+  name         = "tf-destroy-test-fn"
+  environment  = fission_environment.python.name
+  package_name = fission_package.pkg.name
+  entrypoint   = "main.main"
+}
+
+resource "fission_http_trigger" "route" {
+  name     = "tf-destroy-test-route"
+  function = fission_function.fn.name
+  url      = "/destroy-test"
+  methods  = ["GET"]
+}