Fuzzing: Add Flags & SDK Options

[tarunKoyalwar]

Proposed Changes

• Fuzzing templates will only be loaded when -fuzz flag is used or -im is not list ( implicit enabling of fuzz)

$ ./nuclei -h fuzz
Nuclei is a fast, template based vulnerability scanner focusing
on extensive configurability, massive extensibility and ease of use.

Usage:
  ./nuclei [flags]

Flags:
   -fuzz  enable and run fuzzing templates

New SDK Options

// WithAuthOptions allows setting a custom authprovider implementation
func WithAuthProvider(provider authprovider.AuthProvider) NucleiSDKOptions {

// LoadSecretsFromFile allows loading secrets from file
func LoadSecretsFromFile(files []string, prefetch bool) NucleiSDKOptions {

// EnableFuzzTemplates allows enabling template fuzzing
func EnableFuzzTemplates() NucleiSDKOptions {

// LoadTargetsWithHttpData loads targets that contain http data from file it currently supports
// multiple formats like burp xml,openapi,swagger,proxify json
// Note: this is mutually exclusive with LoadTargets and LoadTargetsFromReader
func (e *NucleiEngine) LoadTargetsWithHttpData(filePath string, filemode string) error {