Add typing to the RoCE module

[haggaie]

Checklist:

• If you are new to Scapy: I have checked CONTRIBUTING.md (esp. section submitting-pull-requests)
• I squashed commits belonging together
• I added unit tests or explained why they are not relevant
• I executed the regression tests for Python2 and Python3 (using tox or, cd test && ./run_tests_py2, cd test && ./run_tests_py3)
• If the PR is still not finished, please create a Draft Pull Request

I tried following the instructions for the Hinty project (#2158).

[codecov]

Codecov Report

Merging #2858 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #2858   +/-   ##
=======================================
  Coverage   88.20%   88.21%           
=======================================
  Files         254      254           
  Lines       54323    54324    +1     
=======================================
+ Hits        47917    47921    +4     
+ Misses       6406     6403    -3     

Impacted Files	Coverage Δ
scapy/contrib/roce.py	94.02% <100.00%> (+0.09%)	⬆️
scapy/arch/windows/__init__.py	68.50% <0.00%> (-0.19%)	⬇️
scapy/layers/tls/automaton_cli.py	76.00% <0.00%> (-0.12%)	⬇️
scapy/layers/inet.py	74.58% <0.00%> (+0.07%)	⬆️
scapy/layers/tls/crypto/cipher_aead.py	81.73% <0.00%> (+0.43%)	⬆️
scapy/layers/tls/record.py	91.59% <0.00%> (+0.81%)	⬆️

[gpotter2]

Looks good to me ! Thanks for the PR