feat: return error message in the grpc server

[LinuxSuRen]

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[codacy-production]

Coverage summary from Codacy

Merging #34 (e302859) into master (a941923) - See PR on Codacy

Coverage variation	Diff coverage
+0.02%	75.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (a941923)	870	742	85.29%
Head commit (e302859)	871 (+1)	743 (+1)	85.30% (+0.02%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#34)	4	3	75.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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