Support for Apache merge configurations

[gzurl]

At httpd.conf, we might have different <Location> groups that overlap with each other:

<Location /python_apps/app_1>
   WasmModule /var/www/modules/python3.11
</Location>

<Location /python_apps/app_2>
   WasmModule /var/www/modules/python3.12
</Location>

<Location /python_apps>
   WasmModule /var/www/modules/python3.11
</Location>

The latest <Location> group above will shadow the other more specific configurations.

This can be solved by adding support for merge configurations in mod_wasm.c.