ARI: Added new functionality to load a single module.

An http request can be sent to load an Asterisk module. If the
module can not be loaded or is loaded already, an error response
will be returned.

The command curl -v -u user:pass -X POST 'http://localhost:8088/ari
/asterisk/modules/{moduleName}'" (or something similar, depending on
configuration) can be run in the terminal to access this new
functionality.

For more information, see:
https://wiki.asterisk.org/wiki.display/~bford/Asterisk+ARI+Resource

* Added new ARI functionality
* Asterisk modules can be loaded through http requests

ASTERISK-25173

Change-Id: I9e05d5b8c5c666ecfef341504f9edc1aa84fda33