https://go.dev/doc/modules/release-workflow#breaking
Fixes https://github.com/woodpecker-ci/woodpecker/issues/2913 fixes
#2654
```
runephilosof@fedora:~/code/platform-woodpecker/woodpecker-repo-configurator (master)$ go get go.woodpecker-ci.org/woodpecker@v2.0.0
go: go.woodpecker-ci.org/woodpecker@v2.0.0: invalid version: module contains a go.mod file, so module path must match major version ("go.woodpecker-ci.org/woodpecker/v2")
```
---------
Co-authored-by: qwerty287 <80460567+qwerty287@users.noreply.github.com>
* Refactor: Move agent stats structs to agent/
Based in part on changes by laszlocph (kube branch):
7f4a0c8c12 Factor into Runner
f7fe9edd0b Using Runner in server
* Refactor: Add Runner constructor with counter field
Based in part on changes by laszlocph (kube branch):
7f4a0c8c12 Factor into Runner
f7fe9edd0b Using Runner in server
* Refactor: Move Runner to agent/ package
Based in part on changes by laszlocph (kube branch):
7f4a0c8c12 Factor into Runner
f7fe9edd0b Using Runner in server
* Refactor: pass pipeline.backend.Engine into agent.Runner
Based in part on changes by laszlocph (kube branch):
7f4a0c8 Factor into Runner
f7fe9ed Using Runner in server
* Use well-known function signature for WriteTo
* Rename stats.go -> state.go
Co-authored-by: Anbraten <anton@ju60.de>
