Adding a variable to override Kubernetes API service

[Nberezhnoy]

This merge request introduces a new configuration variable, kubernetes_api_address, to override the default Kubernetes API server address. This is necessary because the Kubernetes API service name may differ in some installations, making it impossible to collect metrics.

[bentonam]

@Nberezhnoythank you for the contribution, this is a great idea! I would prefer that new arguments optional arguments that are added are added to the end of the argument list instead of at the top above other required arguments. Can you change the order of arguments in both he alloy module and documentation?

[CLAassistant]

All committers have signed the CLA.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[Nberezhnoy]

@bentonam hi, i updated the order of the arguments, please check