Feature/sap label support for odata_service_info_for_Z_V_MM03 with Include detailed metadata information

[viktorashi]

I've added a little feature (which helped me in what I was doing) which also takes into account the sap:label= from a certain $metadata endpoint, if there exists one.

So for example, if you have an extry like this in the XML $metadata:

<Property Name="A0MATERIAL" Type="Edm.String" MaxLength="40" sap:aggregation-role="dimension" sap:text="A0MATERIAL_T" sap:label="Material" sap:creatable="false" sap:updatable="false"/>

Calling the odata_service_info_for_Z_V_MM03 with Include detailed metadata information turned on, the result will look like:

entity_types_detail/<entity_name>/properties/ entry will also look like:

6:
{
name:"A0MATERIAL",
type:"Edm.String",
nullable:true,
is_key:false,
sap_label:"Material"
}

Also added a test case for it.

Now: Just for a headsup, and I'm sorry in advance: I have no idea how to write Go, I just needed it for something and this is the best GPT5.2-Codex running in Codex CLI could whip out.

In reality, maybe this should be under some flag? And the structure of the patch probably doesn't even match with the way PR's are usually filed in here, but take it with a grain of salt in case anyone needs this.

Again, i know Open source is already inundated with AI slop and I don't wanna contribute to it that much, but yeah, if you need it, feel free to clone / build from my branch

[viktorashi]

Also added some support for sap aggregation roles while i was at it, I don't think there's much point in anyone trying to solve those conflicts since it's just AI, single use-case slop =))