Implemented specialized conversion for `helm_release` resources.

Description

This PR implements custom conversion handling for helm_release resources and maps them to resources of type kubernetes:helm.sh/v3:Release.

Addresses #58 Fixes https://github.com/pulumi/pulumi-kubernetes/issues/2744 because the type mapping is also handled for state conversions.

Implemented using a specialized version of convertBody called convertHelmReleaseResource which handles converting the supported fields, their required renames, nesting and rewrites (see examples below or full example added to the tests)

It doesn't handle the helm provider blocks, haven't looked into these for this implementation, only the helm_release itself.

Basic example

resource "helm_release" "example" {
  name  = "redis"
  chart = "redis"
}

becomes:

resource "example" "kubernetes:helm.sh/v3:Release" {
  name = "redis"
  chart = "redis"
}

Example with repository options

Repository options in the tf schema are top-level fields but in pulumi-kubernetes, these are subfields of an options object repositoryOpts:

resource "helm_release" "example" {
  name  = "redis"
  chart  = "redis"
  repository = "https://charts.bitnami.com/bitnami"
  repository_ca_file = "./ca.pem"
  repository_cert_file = "./cert.pem"
  repository_key_file = "./key.pem"
  repository_password = "password"
  repository_username = "username"
}

becomes:

resource "example" "kubernetes:helm.sh/v3:Release" {
  name = "redis"
  chart = "redis"
  repositoryOpts = {
    repo     = "https://charts.bitnami.com/bitnami"
    caFile   = "./ca.pem"
    certFile = "./cert.pem"
    keyFile  = "./key.pem"
    password = "password"
    username = "username"
  }
}

Example with custom chart values

In tf, the helm_release resources uses blocks set_value, set_list and set_sensitive that have attributes name and value. With this implementation, these blocks are converted to a single values map as follows:

resource "helm_release" "example" {
  name  = "redis"
  chart = "redis"
  set {
    name  = "set_1"
    value = "value1"
  }
  set_list {
    name  = "set_list_1"
    value = "value1"
  }
  set_sensitive {
    name  = "set_sensitive_1"
    value = "value1"
    type = "string"
  }
}

becomes:

resource "example" "kubernetes:helm.sh/v3:Release" {
  name = "redis"
  chart = "redis"
  values = {
    "set_1"           = "value1"
    "set_list_1"      = "value1"
    "set_sensitive_1" = secret("value1")
  }
}

TODOs for other fields:

The block postrender { binaryPath = "bin", args = ["args"] } and field values = ["key:value"] are not converted yet. I need to think a bit more about these two because postrender block should be combined into a single string postrender = "bin arg"

the values field need to map to valueYamlFiles where each element of the list should be wrapped in stringAsset:

# tf
values = ["key:value"]
# pulumi
valueYamlFiles = [stringAsset("key:value")]

pulumi / pulumi-converter-terraform