feat: Add KeepSome to log plugin

[kris-ava]

Allows users to only keep some of the old plugins (thus making sure that logging does not hog all available disk space)

[FabianLars]

Hi, thanks so much for contributing and sorry for the huge delay!
I'll do a proper review tomorrow but wanted to ask you for a changefile similar to https://github.com/tauri-apps/plugins-workspace/blob/v2/.changes/dialog-async-message-dialog.md already.

[tance77]

@FabianLars @kris-ava Just wanted to circle back on this. I to have a use case where i don't want to keep "everything" but simply the last X days. Also maybe a version 1 port :)

[MGough]

Looks like this has been sitting a while! Is there any chance this could be backported to V1?

[FabianLars]

We mostly stopped backporting features to v1, but we're still looking at community PRs that do so.

[MGough]

Thanks for the speedy response @FabianLars - I may open a PR to do so in the near future if @kris-ava is not interested in doing so themselves as this feature is something I'd love to be able to use before V2 is ready for production use!

[Dexus]

@FabianLars Can we please make it to get it into the next release?

[github-actions]

Package Changes Through a5a79dd

There are 6 changes which include updater with minor, updater-js with minor, autostart with minor, autostart-js with minor, log with minor, log-js with minor

Planned Package Versions

The following package releases are the planned based on the context of changes in this pull request.

package	current	next
api-example	2.0.26	2.0.27
api-example-js	2.0.22	2.0.23
autostart	2.3.0	2.4.0
autostart-js	2.3.0	2.4.0
log	2.4.0	2.5.0
log-js	2.4.0	2.5.0
updater	2.7.1	2.8.0
updater-js	2.7.1	2.8.0

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[FabianLars]

sry for the delay again