core: add --track-block-recvd-times option to nervad

[benevanoff]

One of the questions I am looking to answer while I complete #40 is "how long does it take for a block to propagate across the network?"

This PR adds a new flag, --track-block-recvd-times to the nerva daemon. When the flag is enabled, each time that a block notification is received, we will log the block height, block hash, local timestamp, and notification origin peer IP to a new file.

The new file is a headless CSV of the format block_height,block_hash,peer_ip:peer_port,local_timestamp_block_received

The new file will be stored to $DATA_DIR/blocks_recvd_data.csv

Example:

4139057,<e18bbb18441a3bab1256871db02cc673676750f09a2abe1c70d869e493086afe>,94.155.221.131:17565,1773799090
4139057,<e18bbb18441a3bab1256871db02cc673676750f09a2abe1c70d869e493086afe>,193.77.232.76:17565,1773799090
4139057,<e18bbb18441a3bab1256871db02cc673676750f09a2abe1c70d869e493086afe>,84.229.71.126:17565,1773799090
4139057,<e18bbb18441a3bab1256871db02cc673676750f09a2abe1c70d869e493086afe>,1.158.18.218:17565,1773799091
4139058,<3689d929d156a14d38a99893b7b23c5005d2f36f7d19df5964cd2bfe1e2d94ca>,212.116.78.107:17565,1773799132
4139058,<3689d929d156a14d38a99893b7b23c5005d2f36f7d19df5964cd2bfe1e2d94ca>,94.155.221.131:17565,1773799132
4139058,<3689d929d156a14d38a99893b7b23c5005d2f36f7d19df5964cd2bfe1e2d94ca>,1.158.18.218:17565,1773799132
4139058,<3689d929d156a14d38a99893b7b23c5005d2f36f7d19df5964cd2bfe1e2d94ca>,193.77.232.76:17565,1773799132
4139058,<3689d929d156a14d38a99893b7b23c5005d2f36f7d19df5964cd2bfe1e2d94ca>,84.229.71.126:17565,1773799132
3868655,<8315b4e3b6b3ece94856cc1783ea30c008458f41e969629d001b1483438f4b5f>,62.204.132.5:17565,1773799207
4139059,<9ff5977c1bdb2f9fb14e06c7cd2b5c4304b5385596cd0d52aee4ff3be5152cfd>,212.116.78.107:17565,1773799216
4139059,<9ff5977c1bdb2f9fb14e06c7cd2b5c4304b5385596cd0d52aee4ff3be5152cfd>,94.155.221.131:17565,1773799216
4139059,<9ff5977c1bdb2f9fb14e06c7cd2b5c4304b5385596cd0d52aee4ff3be5152cfd>,84.39.180.67:17565,1773799216
4139059,<9ff5977c1bdb2f9fb14e06c7cd2b5c4304b5385596cd0d52aee4ff3be5152cfd>,193.77.232.76:17565,1773799216
4139059,<9ff5977c1bdb2f9fb14e06c7cd2b5c4304b5385596cd0d52aee4ff3be5152cfd>,184.164.3.189:17565,1773799216
4139059,<9ff5977c1bdb2f9fb14e06c7cd2b5c4304b5385596cd0d52aee4ff3be5152cfd>,84.229.71.126:17565,1773799216

[sn1f3rt]

Bug is fixed, LGTM.

[sn1f3rt]

@benevanoff Please rebase on master so we can run CI on this.

[benevanoff]

@sn1f3rt Sure, Ive pulled 1091aa4f5b7a15acfaae3edafc13182fcd528707 and f4980618d5f0eba9b5cad934e3b3ecf116ffea4d into my branch.

[sn1f3rt]

Approved CI run