Remove symlinks from HTTP API module

[2snEM6]

Expected behavior

HTTP API should have symlinks in helpers folder

Actual behavior

HTTP API has symlinks poining to chain/helpers folder. This was done as a temporary solution to avoid duplicated files due to the extraction of api logic from Chain module to a separate module HTTP API.

Symlinks are also causing problems with npm pack.

What we have to do now is:

• Remove symlinks
• See what to do with the shared logic between Chain and HTTP API modules on helpers module so no files are left duplicated and no symlinks are present either.

Address this Issue ONLY after #3020 is merged.

Steps to reproduce

Which version(s) does this affect? (Environment, OS, etc...)

development branch

[2snEM6]

Address this Issue ONLY after #3020 is merged.