feat: add writeFile function to expr

[LinuxSuRen]

No description provided.

[sonarqubecloud]

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0 Bugs
0 Vulnerabilities
0 Security Hotspots
1 Code Smell

No Coverage information
0.6% Duplication

[github-actions]

There are 21 test cases:

API	Average	Max	Min	Count	Error
POST http://localhost:8080/server.Runner/CreateTestSuite	2.77311ms	2.77311ms	2.77311ms	1	0
gRPC 127.0.0.1:7070/server.Runner/FunctionsQuery	2.464189ms	3.302968ms	1.772709ms	3	0
gRPC 127.0.0.1:7070/server.Runner/FunctionsQueryStream	2.215032ms	2.644821ms	1.585282ms	3	0
POST http://localhost:8080/server.Runner/GenerateCode	2.195037ms	2.195037ms	2.195037ms	1	0
gRPC 127.0.0.1:7070/server.Runner/GetVersion	2.048725ms	2.839628ms	1.140733ms	3	0
POST http://localhost:8080/server.Runner/FunctionsQuery	1.789005ms	1.789005ms	1.789005ms	1	0
POST http://localhost:8080/server.Runner/ConvertTestSuite	1.757089ms	1.757089ms	1.757089ms	1	0
POST http://localhost:8080/server.Runner/ListTestCase	1.313682ms	1.428508ms	1.198857ms	2	0
POST http://localhost:8080/server.Runner/GetSuites	1.205063ms	1.205063ms	1.205063ms	1	0
POST http://localhost:8080/server.Runner/GetSuggestedAPIs	876.009µs	876.009µs	876.009µs	1	0
POST http://localhost:8080/server.Runner/GetTestCase	869.867µs	869.867µs	869.867µs	1	0
POST http://localhost:8080/server.Runner/GetVersion	692.12µs	692.12µs	692.12µs	1	0
POST http://localhost:8080/server.Runner/GetTestSuite	659.502µs	659.502µs	659.502µs	1	0
POST http://localhost:8080/server.Runner/GetStores	653.762µs	653.762µs	653.762µs	1	0
POST http://localhost:8080/server.Runner/DeleteTestSuite	637.609µs	652.877µs	622.342µs	2	0
POST http://localhost:8080/server.Runner/PopularHeaders	622.801µs	622.801µs	622.801µs	1	0
POST http://localhost:8080/server.Runner/UpdateTestSuite	615.86µs	615.86µs	615.86µs	1	0
POST http://localhost:8080/server.Runner/ListCodeGenerator	599.904µs	599.904µs	599.904µs	1	0
POST http://localhost:8080/server.Runner/ListConverter	494.887µs	494.887µs	494.887µs	1	0
POST http://localhost:8080/server.Runner/GetSecrets	476.39µs	476.39µs	476.39µs	1	0
tRPC Hello	370.141µs	370.141µs	370.141µs	1	1