Dumb TokensClient Validate method

[sanchitrk]

This seems to be not the intended behavior, passing token has no effect on the method:
line

func (c *TokensClient) Validate(token string) (int64, error) {
	r, err := c.client.Get("/v1/auth/validate", nil)
	if err != nil {
		return 0, fmt.Errorf("failed to request validation: %s", err)
	}
	defer r.Body.Close()

	if r.StatusCode != http.StatusOK {
		return 0, fmt.Errorf("failed to validate token: %w", parseResponseError(r))
	}

The above still works as the Client.token is already set by pre auth run.

Perhaps using GetWithHeaders by passing the token should fix.