Pass down config to packages

[ishank011]

We have multiple packages such as metrics and mime which provide standalone functionalities and are not initialized by any HTTP or GRPC services which can pass down the config to it. For the metrics package, we implemented a workaround where we started an HTTP service just to pass down the config.

For such packages, we should have a provision that these can be initialized just by adding the config through the toml file. cc @glpatcern