feat(exp): add actionutil.AllForResource

[jooola]

Allow the users to fetch actions related to a specific resource.

This may be used as follows:

actions, err := actionutil.AllForResource(ctx,
	client.Firewall.Action,
	hcloud.ActionListOpts{Status: []hcloud.ActionStatus{hcloud.ActionStatusRunning}},
	hcloud.ActionResourceTypeServer, server.ID,
)
if err != nil {
	return err
}
if err := client.Action.WaitFor(ctx, actions...); err != nil {
	return err
}

[codecov]

Codecov Report

Attention: Patch coverage is 77.77778% with 2 lines in your changes missing coverage. Please review.

Project coverage is 71.47%. Comparing base (743eabb) to head (824cb91).
Report is 24 commits behind head on main.

Files with missing lines	Patch %	Lines
hcloud/exp/actionutil/actions.go	77.77%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #522      +/-   ##
==========================================
+ Coverage   71.46%   71.47%   +0.01%     
==========================================
  Files          46       46              
  Lines        3935     3944       +9     
==========================================
+ Hits         2812     2819       +7     
- Misses        710      711       +1     
- Partials      413      414       +1     

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[jooola]

Here is an example: hetznercloud/packer-plugin-hcloud@main...tmp-use-actionutil.allforresource