feat(router): add errorhandling functionality

[Tieske]

fixes #152 by adding errorhandling (and a confgurable errorhandler) to the router plugin

Here's example output (provided LuaLogging is installed)

Tue Mar  3 21:38:50 2026 DEBUG Handler created, without location
Pegasus is up on 0.0.0.0:9090
Tue Mar  3 21:38:50 2026 INFO Pegasus is up on 0.0.0.0:9090
Tue Mar  3 21:38:57 2026 INFO Request for: GET /api/1v0/people/John
Tue Mar  3 21:38:57 2026 DEBUG served John's data
Tue Mar  3 21:39:02 2026 INFO Request for: GET /api/1v0/people
Tue Mar  3 21:39:02 2026 ERROR Request for: GET /api/1v0/people, failed: example/app.lua:45: something really bad happend!!!!
stack traceback:
        [C]: in function 'error'
        example/app.lua:45: in field '?'
        ./src/pegasus/plugins/router.lua:297: in function <./src/pegasus/plugins/router.lua:272>
        [C]: in function 'xpcall'
        ./src/pegasus/plugins/router.lua:328: in function 'pegasus.plugins.router.newRequestResponse'
        ./src/pegasus/handler.lua:132: in function 'pegasus.handler.pluginsNewRequestResponse'
        ./src/pegasus/handler.lua:255: in function 'pegasus.handler.processRequest'
        ./src/pegasus/init.lua:118: in function 'pegasus.start'
        example/app.lua:119: in main chunk
        [C]: in ?
Tue Mar  3 21:39:07 2026 INFO Request for: GET /api/1v0/people/John
Tue Mar  3 21:39:07 2026 DEBUG served John's data

[EvandroLG]

Looks great, thanks! :)

[scossu]

Wonderful. Are you planning to release a new version soon?

[EvandroLG]

@scossu I just released a new version with the fix implemented by @Tieske
Thanks guys!