Merge pull request databendlabs#1305 from dantengsky/fix-1304

remove `conf` from RpcService by using session_mgr's conf

Merge pull request databendlabs#1159 from PsiACE/rust-2021

[rust 2021] migrate to rust 2021

Merge pull request databendlabs#1257 from SGZW/fix-race

ISSUE 1254: fix race

Merge pull request databendlabs#1253 from BohuTANG/dev-cli-938-part-2

FEATURE-938: datafuse cli add history

Merge pull request databendlabs#1248 from drmingdrmer/sm-meta

[store] feature: disk backed state machine

Merge pull request databendlabs#1244 from SGZW/remove_useless_code

ISSUE-1225: remove fusestore/store/src/engine/mem_engine.rs

Merge pull request databendlabs#1226 from drmingdrmer/jaeger-tracing

[common/tracing] feature: report distributed tracing stat to jaeger

Merge pull request databendlabs#1210 from PsiACE/RUSTSEC-2020-0036

[deps] bump deps to fix RUSTSEC-2020-0036

Merge pull request databendlabs#1198 from dantengsky/fix-1197

bug fix: clean data parts metadata while dropping table

Merge pull request databendlabs#1185 from jyizheng/group_hash_test

[datavalues] unit test for group_hash