feat: add openwemi namespace configuration

[nishad]

DCMI Namespace Resolver Service is now open for public testing and available at ns.dublincore.org. Though the service is still under development, it is fully functional and can be used to resolve openwemi namespace URIs to their corresponding landing URLs.

The detailed documentation for the namesapce is availabe at https://github.com/dcmi/openwemi/tree/main/namespace#readme. The service is a configuration driven service that uses namespace specific configuration files to determine the landing URL, media types, and other settings for each namespace. The configuration files are maintained in pkl format and provided in the repository.

The configuration file for the OpenWEMI namespace is available at openwemi.pkl. Any modifications to the configuration should be made in the configuration file and then deployed to the resolver service. This process is manually managed and should raise a ticket to the DCMI webmanager to update the namesapce.

You can add more media types to the configuration file to support content negotiation for more formats. The configuration file is self-explanatory and can be validated using the pkl CLI tools.

For a couple of months, the vocabulary files will be served from the github website (dcmi.github.io). The vocabulary files will be moved to the DCMI website by the end of the year. But other documents can be moved to the DCMI website once it is ready.