feat: secure runtime plugins

[zefr0x]

This is about plugins to extend supported news informants in run-time.

• Can be loaded/unloaded in runtime without restarting
• Most likely WASM-based
• Python scripting might be considered in addition
• Sandboxed with no access to any system resources or networking capabilities except via the provided interface and with strict rules
• Their role will be contained on fetching and parsing data as a flow of a news informant execution process, so they will not be running all time or as waiting services
• Restricted in computation resource usage and have a time limit to be aborted as a protection against denial of service attacks/bugs