feature: add the ua-parser plugin to the filter plugins

[csabatuz-chess]

This changeset adds the https://github.com/bungoume/fluent-plugin-ua-parser Fluent plugin to the filters.

Required for: kube-logging/logging-operator#1594

[pepov]

@csabatuz-chess thanks for your contribution! I just realized we haven't added a check to make sure the lock file is in sync with the dependencies so I've just updated it manually and will add a follow up issue to make sure the CI is checking it

[pepov]

follow up: #89

[csabatuz-chess]

@pepov Thanks for the mopping-up, the lockfile evaded my attention.
Happy to contribute.

I am following a somewhat selfish path here, we are using kube-logging widely on our infra, and this plugin was the only thing that's missing to be able to satisfy our output requirements.
So here I tried to find the shortest path to get us what we need, please do point out if there's a bigger picture that I'm missing.

Thanks again, looking forward to discuss this and the other PR, let me know if I took a wrong turn in either, and I'll correct.

[pepov]

All good, thanks for the context! Today we have capacity to support a single image with three layers (base,filters,full), so if there is a legitimate use of a plugin we can add it to one of these layers, just as you did.

There is a chance that a new plugin introduces a security vulnerability or some regression and in that case we might have to pull it out and then you will have to add it and build it on your own on top of our base. In this case it doesn't make any changes in the existing dependencies and if the plugin is not used I don't see it doing any harm.

[OverOrion]

Thank you for your contribution, much appreciated! 🙌

[csabatuz-chess]

Thank you, please also take a look at the PR that attemps to use this new plugin:
kube-logging/logging-operator#1594