feat: brioche configuation for devnet

[egonspace]

I reopen https://github.com/wemixarchive/go-wemix/pull/108 which was merged not to devnet but to dev.

• [x] 1. this one; add ci for devnet (same with master.ci; run long time test) applied at https://github.com/wemixarchive/go-wemix/pull/91
• [x] 2. merge PR; dev -> devnet (including brioche feature. v0.10.8): this needs ci working for merge: https://github.com/wemixarchive/go-wemix/pull/92
• [x] 3. add devnet-only feature; devnet hard fork configuration