* [golang] Add support for text parsing with json struct tags
Add struct tags to Go native structs generated when object API is used.
This allows to use the same JSON file as for C++ text
parsing(i.e. snake_case vs CamelCase) and thus enabling text parsing
for Go(when using object API).
* [golang] Add test for text parsing
Added small test to check and demonstrate text parsing in Go.
Also, ran clang-format on cpp file changes.
* go: replace objAPI-generated Pack func with method
See discussion at https://github.com/google/flatbuffers/issues/5668
* go: replace generated union type UnPack func with method
Similar to discussion https://github.com/google/flatbuffers/issues/5668
But signature:
```
func AnyUnPack(t Any, table flatbuffers.Table) *AnyT
```
Becomes,
```
func (rcv Any) UnPack(table flatbuffers.Table) *AnyT
```
As recommended by https://golang.org/pkg/cmd/go/internal/generate/:
To convey to humans and machine tools that code is generated,
generated source should have a line early in the file that
matches the following regular expression (in Go syntax):
^// Code generated .* DO NOT EDIT\.$
* Support binary search for struct in cpp
CreateVectorOfSortedStruct is provided for convenience.
* fix continuous-integration error
* add generated files
* compile Ability.cs in csharp test
* compile Ability.cs in csharp
* modify according to code review
