Add unicast interest feature #282

Job	Run time
Test multicast and unicast fragmentation	30s
Check c99 compilation	11s
Check codebase format with clang-format	4s
Modular build on ubuntu-latest (1, 1, 1, 1)	35s
Build and test raweth transport on ubuntu-latest (1)	26s
Run unit tests on ubuntu-latest	29s
Modular build on ubuntu-latest (1, 1, 1, 0)	31s
Build and test raweth transport on ubuntu-latest (0)	40s
Modular build on ubuntu-latest (1, 1, 0, 1)	53s
Modular build on ubuntu-latest (1, 1, 0, 0)	31s
Modular build on ubuntu-latest (1, 0, 1, 1)	45s
Modular build on ubuntu-latest (1, 0, 1, 0)	33s
Modular build on ubuntu-latest (1, 0, 0, 1)	32s
Build and test in single thread on ubuntu-latest	26s
Modular build on ubuntu-latest (1, 0, 0, 0)	45s
Modular build on ubuntu-latest (0, 1, 1, 1)	27s
Modular build on ubuntu-latest (0, 1, 1, 0)	23s
Modular build on ubuntu-latest (0, 1, 0, 1)	26s
Modular build on ubuntu-latest (0, 1, 0, 0)	18s
Modular build on ubuntu-latest (0, 0, 1, 1)	52s
Modular build on ubuntu-latest (0, 0, 1, 0)	24s
Modular build on ubuntu-latest (0, 0, 0, 1)	23s
Modular build on ubuntu-latest (0, 0, 0, 0)	23s
	11m 27s

Provide feedback