[Rehearsal] Merge "mx-sdk-specs" into "mx-specs"

[andreibancioiu]

Do not approve this just yet.
This is just a rehearsal for merging mx-sdk-specs into mx-specs.

Steps performed to prepare the PR:

# clone both repositories in a workspace
mkdir merging-sandbox && cd merging-sandbox
git clone git@github.com:multiversx/mx-sdk-specs.git
git clone git@github.com:multiversx/mx-specs.git

# create a wrapping folder for the SDK specs
cd mx-sdk-specs
git filter-repo --to-subdirectory-filter network-interaction-sdk

# add a "fake" (local) remote
cd ../mx-specs
git remote add sdk-specs ../mx-sdk-specs
git fetch sdk-specs

# do the merge in a new branch, then push it
git checkout -b merge-sdk-specs
git merge --allow-unrelated-histories sdk-specs/main
git push --set-upstream origin merge-sdk-specs

# cleanup: remove "merging-sandbox"

References:

• https://stackoverflow.com/a/62096626/1475331