feat(preflight): build preflight package for GCP

[PengyuanZhao]

Summary

This PR creates the package which serves functions to do preflight checks for GCP integrations including Agentless, AuditLog and Config

Depend on #1716

How did you test this change?

Run integration test: preflight_gcp_test.go

Run the following and check the output:

package main

import (
	"fmt"
	"os"

	"github.com/lacework/go-sdk/v2/lwpreflight/gcp"
)

func main() {
	preflight, err := gcp.New(gcp.Params{
		Agentless: true,
		Config:    true,
		AuditLog:  true,
		Region:    "us-west2",
		ProjectID: "abc-demo-project-123",
		CredentialsFile: "/Users/pengyuan/.config/gcloud/application_default_credentials.json",
	})
	if err != nil {
		fmt.Println(err)
		return
	}

	result, err := preflight.Run()
	if err != nil {
		fmt.Println(err)
		return
	}

	fmt.Printf("%#v\n", result)
}

[github-actions]

Lacework Code Security found potential new issues in this PR.

sca found potential 2 new issues

• incorrect-error-checking-go (vendor/google.golang.org/grpc/rpc_util.go: github.com/lacework/go-sdk/v2)
  More details

  Detected incorrect error-checking logic

		if limit := int64(maxReceiveMessageSize); limit < math.MaxInt64 {
			dcReader = io.LimitReader(dcReader, limit+1)
		}
		out, err := mem.ReadAll(dcReader, pool)
		if err != nil {
			out.Free()
			return nil, status.Errorf(codes.Internal, "grpc: failed to read decompressed data: %v", err)
		}

		if out.Len() > maxReceiveMessageSize {
			out.Free()
			return nil, status.Errorf(codes.ResourceExhausted, "grpc: received message after decompression larger than max %d", maxReceiveMessageSize)
		}

• GPL-2.0 (vendor/go.opentelemetry.io/otel/requirements.txt: codespell@2.4.1)
  More details

  Package codespell@2.4.1 has license GPL-2.0 (category: restricted)

[lacework-code-security]

(Audit Mode) Lacework IAC found 2 new violations

Violation	Severity	File	Guidelines
Ensure that HEALTHCHECK instructions have been added to container images	Low	dependencies.Dockerfile	VIEW
Ensure that a user for the container has been created	Low	dependencies.Dockerfile	VIEW

[lacework-code-security]

(Audit Mode) sca found potential 2 new issues

• incorrect-error-checking-go (vendor/google.golang.org/grpc/rpc_util.go: github.com/lacework/go-sdk/v2)
  More details

  Detected incorrect error-checking logic

		if limit := int64(maxReceiveMessageSize); limit < math.MaxInt64 {
			dcReader = io.LimitReader(dcReader, limit+1)
		}
		out, err := mem.ReadAll(dcReader, pool)
		if err != nil {
			out.Free()
			return nil, status.Errorf(codes.Internal, "grpc: failed to read decompressed data: %v", err)
		}

		if out.Len() > maxReceiveMessageSize {
			out.Free()
			return nil, status.Errorf(codes.ResourceExhausted, "grpc: received message after decompression larger than max %d", maxReceiveMessageSize)
		}

• GPL-2.0 (vendor/go.opentelemetry.io/otel/requirements.txt: codespell@2.4.1)
  More details

  Package codespell@2.4.1 has license GPL-2.0 (category: restricted)

[lokesh-vadlamudi]

LGTM