Add support for membership event history
While `./main.py` is complete and gives to Duniter everything needed to bootstrap a network with correct initial state, `./squid-*.py` scripts only cover:
- block history
- transaction history
- certification history
Membership event history is not covered as stated in todo: https://git.duniter.org/tools/py-g1-migrator/-/blob/effe52251c544f285e7213b1a0487b102e51309f/lib/functions.py#L174-L179
The history of membership renewal and revocation is then not available in `duniter-squid` and will not appear in Cesium v2.
issue