binexport: add typing where applicable #5786

Job	Run time
rule_linter	1m 7s
changelog_format	4s
code_style	1m 15s
Tests in 3.8 on ubuntu-20.04	3m 15s
Tests in 3.11 on ubuntu-20.04	2m 49s
Tests in 3.8 on windows-2019	5m 47s
Tests in 3.11 on windows-2019	6m 25s
Tests in 3.8 on macos-11	5m 12s
Tests in 3.11 on macos-11	5m 9s
Tests in 3.9 on ubuntu-20.04	3m 20s
Tests in 3.10 on ubuntu-20.04	3m 14s
Binary Ninja tests for ${{ matrix.python-version }}	0s
Ghidra tests for ${{ matrix.python-version }}	0s
	37m 37s

Provide feedback