refactor: Improve give_locate_template

[ravinderk]

Issue Overview

In give_get_template fn we are passing $template_path and $default_path path to give_locate_template fn but it only accept boolean as second and third param.We can improve this fn to handle default path logic.

This will be helpful to Give addon developers if this give_locate_template fn locates and load template on basis of fn arguments.

For ref: https://github.com/WordImpress/Give/blob/f5bc216de9a8fb778014ab2b9e6e8dea22580d9b/includes/template-functions.php#L54

[DevinWalker]

@ravinderk which milestone?

[raftaar1191]

milestone 2.0