config: add support for additional properties in resource (#4832)

* config: add support for additional properties in resource

This allows the configuration of other attributes than service.name.

Signed-off-by: Alex Boten <aboten@lightstep.com>

* update generated code + changelog

Signed-off-by: Alex Boten <223565+codeboten@users.noreply.github.com>

---------

Signed-off-by: Alex Boten <aboten@lightstep.com>
Signed-off-by: Alex Boten <223565+codeboten@users.noreply.github.com>
Co-authored-by: Aaron Clawson <3766680+MadVikingGod@users.noreply.github.com>
Co-authored-by: Tyler Yahn <MrAlias@users.noreply.github.com>

CHANGELOG.md

@@ -25,6 +25,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 ### Changed
 
 - Change the scope name for the prometheus bridge to `go.opentelemetry.io/contrib/bridges/prometheus` to match the package. (#5396)
+- Add support for settings additional properties for resource configuration in `go.opentelemetry.io/contrib/config`. (#4832)
 
 ### Fixed