Use Arc for ownership instead of references and lifetime annotations

[xmakro]

closes #48

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 69 lines in your changes missing coverage. Please review.

Project coverage is 6.8%. Comparing base (5e66bf7) to head (d7b63dc).

Files with missing lines	Patch %	Lines
ibverbs/src/lib.rs	0.0%	69 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
ibverbs/src/lib.rs	6.2% <0.0%> (-0.1%)	⬇️

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