policy: reduce routes sent to peers based on packetfilter

[kradalby]

Fixes #2365

[ghost]

Pull Request Revisions

Revision	Description
r4	Route accessibility filtering implemented New feature limits route distribution to only routes accessible to specific nodes
r3	Updated routing and ACL filtering logic Refactored policy management to improve route and node filtering based on ACL rules, adding more granular route access control and introducing a new ReduceRoutes function to filter routes for specific nodes
r2	Enhanced ACL and route filtering mechanism Added new route reduction method in policy package with comprehensive ACL filtering for subnet routes, including support for granular access control based on source IPs and destination networks
r1	Policy route and node filtering updated Introduced ReduceNodes and ReduceRoutes methods to handle policy-based filtering of nodes and routes more flexibly, with accompanying test cases and implementation changes.

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