fix: tsdb reader deadlock

1. copy files failed if svc-deleting is still outstanding
2. unnecessary duplication of C:\TDengine in %PATH%
Co-authored-by: Nfreemine <freemine@yeah.net>

feat: data compaction

fix:auto create table & NULL NONE problem for taosx

fix(mnd/sdbdump): return false with null updateDnodeInfoFp

test:modify cmakelist for complication

merge 3.0

merge main

* build: update writing kafka example and document

* fixes kafka demo

* fix: refine wording

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Co-authored-by: Shuduo Sang <sangshuduo@gmail.com>

fix: show vgroups

fix:change list to hash for speed interval data in sml

fix: invild free

fix: adjust some log while split

feat: add explain test case