The TLP library has a subset of functions dedicated entirely to querying REST APIs with fetch. Splitting it into its own library will let us use it in FlamingParrot context without also pulling all of TLP (and its dependencies). It also provides the opportunity to better track its usage when we want to make improvements on our fetch wrapper.

With this request, TLP will have a new dependency: @tuleap/tlp-fetch

Also, this presents the opportunity to expose the "tlp fetch mocks" widely used in Jest tests from this library. People who need to mock TLP fetch functions can include @tuleap/tlp-fetch as a Dev dependency and use its mocks.