* [TD-3197]<fix>: taosdemo and taosdump coverity scan issues.

* exit if read sample file failed.

* fix converity scan issue.

* fix coverity scan issue.

* fix coverity scan memory leak.

* fix resource leak reported by coverity scan.

* fix taosdemo coverity scan issue.

* fix tcsetattr and getchar return value determination bug.

* fix coverity scan issue.

* fix two more coverity scan issues.

* fix stmt batch coverity scan issue.

* change to portable format.

* fix coverity scan issue

* [TD-10578]<fix>: taosdemo rest interface slow.

* fix missed 200

* fix taosdemo coverity scan issue.

* fix taosdemo coverity scan issue.

* fix taosdemo testcase for restful result.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

* cherry pick from develop branch.

* cherry pick 54813175

* [TD-5872]<fix>: taosdemo stmt csv perf improve.

* rand func back to early impl.

* fix windows/mac compile error.

* cherry pick from develop branch.

* merge with develop branch.

* rename MAX_SAMPLES_ONCE_FROM_FILE to reflect reality.

* split func for stmt interlace.

* fix bug that get build path.

* stmt batch interlace works.

* fix start time issue.

* few cleanup.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

* [TD-6479]<fix>: taosdump cmdline align for database sequence.

adopt 'taosdump -D db1,db2,...' format.

* fix core dump issue.