Merge bitcoin/bitcoin#30062: net: add ASMap info in getrawaddrman RPC

1e54d61c46 test: add coverage for `mapped_as` from `getrawaddrman` (brunoerg)
8c2714907d net: rpc: return peer's mapped AS in getrawaddrman (brunoerg)

Pull request description:

  This PR adds two new fields in `getrawaddrman` RPC: "mapped_as" and "source_mapped_as". These fields are used to return the ASN (Autonomous System Number) mapped to the peer and its source. With these informations we can have a better view of the bucketing logic with ASMap specially in projects like [addrman-observer](https://github.com/0xb10c/addrman-observer).

ACKs for top commit:
  fjahr:
    Code review ACK 1e54d61c46
  virtu:
    ACK [1e54d61](1e54d61c46)
  0xB10C:
    ACK 1e54d61c46
  glozow:
    ACK 1e54d61c46

Tree-SHA512: af86bcc7a2e69bebd3fa9eaa2e527e0758c44c0a958de7292514d5f99f8f01f5df3bae11400451268e0255f738ff3acccc77f48fe129937512f1e9d9963c4c5e

test/functional/feature_asmap.py

@@ -27,6 +27,7 @@ import os
 import shutil
 
 from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import assert_equal
 
 DEFAULT_ASMAP_FILENAME = 'ip_asn.map' # defined in src/init.cpp
 ASMAP = '../../src/test/data/asmap.raw' # path to unit test skeleton asmap
@@ -118,6 +119,14 @@ class AsmapTest(BitcoinTestFramework):
         msg = "ASMap Health Check: 4 clearnet peers are mapped to 3 ASNs with 0 peers being unmapped"
         with self.node.assert_debug_log(expected_msgs=[msg]):
             self.start_node(0, extra_args=['-asmap'])
+        raw_addrman = self.node.getrawaddrman()
+        asns = []
+        for _, entries in raw_addrman.items():
+            for _, entry in entries.items():
+                asn = entry['mapped_as']
+                if asn not in asns:
+                    asns.append(asn)
+        assert_equal(len(asns), 3)
         os.remove(self.default_asmap)
 
     def run_test(self):