v0.4.0

@stone1100

[opt]: reduce memory database memory usage by @stone1100 in #1030
[opt]: ignore histogram bucket if count lt 0 by @stone1100 in #1033
[opt]: opt metric field memory store by @stone1100 in #1035
[feat]: memory database approximate memory size by @stone1100 in #1036
[feat]: cleanup memory metric meta/index if not used by @stone1100 in #1037
[enhance]: add self-monitoring metric/docs by @stone1100 in #1040
[feat]: add tsdb limits(namespace/metric/field/tag key/series) by @stone1100 in #1041

[docs]: update architecture image by @stone1100 in #985
[refactor]: use common lib(logger/timeutil/fileutil) by @stone1100 in #986
[feat]: remove duplicate agg types by @joyant in #989
[opt]: succinct trie by @stone1100 in #990
[bug]: fix nil metadata and refactor lindcli by @joyant in #993
[bug:#994]: fix not in statement returns an empty result by @joyant in #996
[feat]: build index on LinDB common kv store by @stone1100 in #997
[chore]: upgrade go version for ci by @stone1100 in #998
[feat:#912]: support comparison binary operations by @joyant in #1000
[feat:#995]: create database by with statement by @joyant in #1002
[bug]: fix read index data panic after kv store compact by @stone1100 in #1004
[chore]: disable golangci-lint cache by @stone1100 in #1006
[feat]: memory database estimate heap size by @stone1100 in #1005
[refactor]: memory database data loader by @stone1100 in #1009
[refactor]: only one storage cluster under broker cluster by @kevin6025 in #1008
[bug:#1012]: fix show metrics returns incorrect results by @joyant in #1013
[feat:#1001]: support promql by @joyant in #1014
[enhance:#1007]: reduce goroutine when write too many data families by @joyant in #1016
[chore]: rebase v0.3.0_bug_fix by @stone1100 in #1025
[bug:#1019]: fix storage node goes dead when gc pause by @stone1100 in #1026
[opt]: compress write data by re-use snappy streaming by @stone1100 in #1027
[docs]: add Japanese README file by @eltociear in #1039

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