feat: [mapmanagement] new module for mapmanagement

[cloud-java-bot]

Generated by @diegomarquezp via generate_new_client_hermetic_build.yaml

Command used:

python generation/new_client_hermetic_build/add-new-client-config.py add-new-library --api-shortname "mapmanagement" --name-pretty "Map Management API" --api-description "The Map Management API is a RESTful service that accepts HTTP requests for map styling data through a variety of methods. It returns formatted configuration data about map styling resources so that you can programmatically manage your Cloud-based map styles." --proto-path "google/maps/mapmanagement/v2beta" --product-docs "https://developers.google.com/maps/documentation/mapmanagement/overview" --library-name "maps-mapmanagement" --distribution-name "com.google.maps:google-maps-mapmanagement" 

[gemini-code-assist]

Code Review

This pull request relocates the iam-admin library entry to maintain alphabetical order, adds a new entry for the mapmanagement API, and performs minor formatting cleanup in existing descriptions. A review comment points out that the new mapmanagement entry is currently out of alphabetical order and should be moved before maps-geocode to remain consistent with the rest of the configuration.

[gemini-code-assist]

The mapmanagement library entry is out of alphabetical order. It should be placed before maps-geocode because mapmanagement precedes maps-geocode alphabetically (the character 'm' in 'mapm' comes before 's' in 'maps-'). Maintaining alphabetical order by api_shortname is consistent with other changes in this PR, such as the relocation of iam-admin.