fix(libsinsp): use size_type in basename transformer

[LucaGuerra]

What type of PR is this?

Uncomment one (or more) /kind <> lines:

/kind bug

Any specific area of the project related to this PR?

Uncomment one (or more) /area <> lines:

/area libsinsp

Does this PR require a change in the driver versions?

No

What this PR does / why we need it:

As per title

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

fix(libsinsp): use size_type in basename transformer, fix build on Windows

[poiana]

LGTM label has been added.

Git tree hash: 7b883a61ade0c41aa643fefc684f628dc72bab8b

[FedeDP]

/milestone 0.19.0

[poiana]

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In response to this:

/milestone 0.19.0

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[FedeDP]

/approve

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: FedeDP, jasondellaluce, LucaGuerra

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[FedeDP]

/milestone 0.18.0

[github-actions]

Perf diff from master - unit tests

     9.54%     -2.55%  [.] sinsp::next
     9.85%     +1.88%  [.] sinsp_parser::reset
     5.88%     -1.42%  [.] sinsp_evt::get_type
     6.41%     -1.38%  [.] sinsp_thread_manager::find_thread
     3.74%     +0.83%  [.] sinsp_parser::process_event
     0.65%     +0.81%  [.] 0x00000000000e7540
     2.44%     +0.80%  [.] std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>::_M_release
     0.94%     +0.49%  [.] sinsp::fetch_next_event
     4.75%     +0.49%  [.] next
     0.10%     +0.49%  [.] sinsp_evt::is_filtered_out

Perf diff from master - scap file

     8.39%     +5.25%  [.] sinsp_filter_check::extract_nocache
     7.72%     -2.08%  [.] std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_construct<char const*>
     3.92%     +2.06%  [.] libsinsp::runc::match_one_container_id
     3.91%     +1.85%  [.] std::_Hashtable<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::shared_ptr<sinsp_container_info const> >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::shared_ptr<sinsp_container_info const> > >, std::__detail::_Select1st, std::equal_to<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::hash<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<true, false, true> >::_M_find_before_node
     3.99%     +1.84%  [.] sinsp_filter_check_thread::extract_single
     4.00%     +1.73%  [.] sinsp_evt_formatter::tostring_withformat
    17.14%     +0.73%  [.] sinsp_filter_check::tostring
     7.13%     +0.72%  [.] std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_construct<char*>
    11.96%     -0.36%  [.] sinsp_filter_check::rawval_to_string
     4.15%     -0.23%  [.] sinsp_filter_check::apply_transformers

Heap diff from master - unit tests

total runtime: -0.09s.
calls to allocation functions: -670 (7528/s)
temporary memory allocations: -185 (2078/s)
peak heap memory consumption: 0B
peak RSS (including heaptrack overhead): 0B
total memory leaked: 0B

Heap diff from master - scap file

total runtime: 0.00s.
calls to allocation functions: 0 (0/s)
temporary memory allocations: -9 (-4500/s)
peak heap memory consumption: 0B
peak RSS (including heaptrack overhead): 0B
total memory leaked: 0B