feat: use a simple template when neither Cmp or Stringer are generated

[smoyer64]

This PR allows go-options to switch to a simpler template when neither cmp or Stringer are requested. An example of the output can be found in the test/golden/configWithoutCmpOrStringer_options.go.tx file and, at the time of this PR results in the following:

package test

// Code generated by github.com/launchdarkly/go-options.  DO NOT EDIT.

type NoCmpOrStringerOption func(c *configWithoutCmpOrStringer) error

func newConfigWithoutCmpOrStringer(options ...NoCmpOrStringerOption) (configWithoutCmpOrStringer, error) {
	var c configWithoutCmpOrStringer
	err := applyConfigWithoutCmpOrStringerOptions(&c, options...)
	return c, err
}

func applyConfigWithoutCmpOrStringerOptions(c *configWithoutCmpOrStringer, options ...NoCmpOrStringerOption) error {
	for _, o := range options {
		if err := o(c); err != nil {
			return err
		}
	}
	return nil
}

func NoCmpOrStringerOptionMyInt(o int) NoCmpOrStringerOption {
	return func(c *configWithoutCmpOrStringer) error {
		c.myInt = o
		return nil
	}
}

In addition, this PR updates the vendoring and tooling.