fix: Update error handling to Laisky/errors/v2 package across project

- Updated error handling across multiple files with `Laisky/errors/v2` package
- Replaced hardcoded error messages with `Laisky/errors` in relay/channel/tencent/adaptor.go
- Added a function to check if a request should be retried in relay/controller/relay.go
- Removed unused imports and variables, and updated comments in various files
- Changed Redis cache handling in model/cache.go
- Refactored error handling in relay/channel/tencent/main.go and relay/channel/baidu/main.go
- Updated import paths and error handling in model/user.go, model/redemption.go, and controller/github.go
- Added import for tiktoken-go package in relay/channel/openai/token.go
- Added GetSign and ParseConfig functions in relay/channel/tencent/main.go
- Replaced specific error imports with a more general one in relay/channel/ali/adaptor.go
- Updated import comments and function calls in relay/channel/ali/adaptor.go
- Added checks and custom error messages in model/token.go
- Removed unused functions and variables in relay/channel/baidu/adaptor.go
- Imported "github.com/Laisky/errors/v2" package in controller/channel-billing.go
- Removed unused import packages in [relay/channel/tencent/adaptor.go](http://relay/channel/tencent/adaptor.go) and relay/channel/palm/adaptor.go
- Updated go.mod and go.sum files with new dependencies and versions

go.sum

@@ -1,3 +1,5 @@
+github.com/Laisky/errors/v2 v2.0.1 h1:yqCBrRzaP012AMB+7fVlXrP34OWRHrSO/hZ38CFdH84=
+github.com/Laisky/errors/v2 v2.0.1/go.mod h1:mTn1LHSmKm4CYug0rpYO7rz13dp/DKrtzlSELSrxvT0=
 github.com/bytedance/sonic v1.5.0/go.mod h1:ED5hyg4y6t3/9Ku1R6dU/4KyJ48DZ4jPhfY1O2AihPM=
 github.com/bytedance/sonic v1.10.0-rc/go.mod h1:ElCzW+ufi8qKqNW0FY314xriJhyJhuoJ3gFZdAHF7NM=
 github.com/bytedance/sonic v1.10.1 h1:7a1wuFXL1cMy7a3f7/VFcEtriuXQnUBhtoVfOZiaysc=