refactor(netx): start moving tls-specific code inside the tlsx pkg (#363)

* refactor(netx): move cert pool code inside tlsx

* refactor(netx): move more tls code inside tlsx

internal/engine/netx/tlsx/generate.go

@@ -30,20 +30,9 @@ package tlsx
 
 //go:generate go run generate.go "{{ .URL }}"
 
-import "crypto/x509"
-
 const pemcerts string = ` + "`" + `
 {{ .Bundle }}
 ` + "`" + `
-
-// CACerts builds an X.509 certificate pool containing the
-// certificate bundle from {{ .URL }} fetch on {{ .Timestamp }}.
-// Returns nil on error along with an appropriate error code.
-func CACerts() (*x509.CertPool, error) {
-	pool := x509.NewCertPool()
-	pool.AppendCertsFromPEM([]byte(pemcerts))
-	return pool, nil
-}
 `))
 
 func main() {