【BugFix】completion接口echo回显支持 #1680

Job	Run time
FD-Clone-Linux / code-clone	28s
FD-Build-Linux / fd-build	56m 4s
Use Build Output	3s
Run FastDeploy Unit Tests and Coverage / run_tests_with_coverage	2m 18s
Run FastDeploy LogProb Tests / run_tests_logprob	1m 51s
Extracted partial CE model tasks to run in CI. / run_ce_cases	5m 16s
Run FastDeploy Unit Tests and Coverage / diff_coverage_report	7s
	1h 6m 7s

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