Merge pull request FISCO-BCOS#1260 from FISCO-BCOS/release-2.8.0

Release 2.8.0

update precompiled doc

update go-sdk documentation (FISCO-BCOS#899)

1. add chainGovernance interface and contractLifeCycle interface in api.md
2. add chainGovernance，contractLifeCycle，consensus，permission commands in console.md

fix python sdk document description (FISCO-BCOS#869)

Modify the code of query tx_gas_limit (FISCO-BCOS#800)

setting tx_gas_limit should execute setSystemConfigByKey (FISCO-BCOS#766

)

* setting tx_gas_limit should execute  setSystemConfigByKey
Should: setSystemConfigByKey tx_gas_limit 400000000
Co-authored-by: Xingqang Bai <[email protected]>

update gm console configure. (FISCO-BCOS#713)

Update rc2 encode protocol (FISCO-BCOS#653)

* update protocol description

* update rc2 description

fix error spelling

Merge pull request FISCO-BCOS#483 from HoweChen/patch-1

修改核心流程阶段英文错误