PointerStringsToStrings.go

Refactor and add core data structures to core package rather than strhelper or other

## Data-structures to be added / Refactor and add core data structures to core package rather than `strhelper` or other

- Strings Collection
- String Collection map
- String to String Map
- String to Strings Map
- String HashSet
- Char to StringsCollection map -> CharCollectionMap

## Background why needed?

Previously common data structures were added to the `strhelper` package, however, it seems like those structures should be available in the core or root level than the specific package.

### Problem Encounter

We want the `core` package to be the root of all packages and `strhelper` is also a core package, such core packages like `strhelper`, `pathhelper` should not depend on each other but all depend on the `core` package, and in specific cases `pathhelper` requires data structures which currently resides in `strhelper`.

### Solution

We need to include the core data structures to reside in the core rather than any other package.

## Worked on Items (strings)

- [x] #12 - StringsCollection
- [x] #12 - Hashset
- [x] #12 - CharCollection
- [x] #12 - JsonResult

## TODOs (string)

- [ ] #12 - CharHashset
- [ ] #12 - HashsetCollections

## TODOs (int)

- [ ] #12 - CharHashset
- [ ] #12 - HashsetCollections
- [ ] #12 - StringsCollection
- [ ] #12 - Hashset
- [ ] #12 - CharCollection
- [ ] #12 - JsonResult

....

## References

- N/A

See merge request !15