Draft: [Humble] Don't reopen file for every seek if we don't have to. Search directionally for the correct file (backport #1117)

[mergify]

This is an automatic backport of pull request #1117 done by Mergify.
Cherry-pick of 0c7c352 has failed:

On branch mergify/bp/humble/pr-1117
Your branch is up to date with 'origin/humble'.

You are currently cherry-picking commit 0c7c352.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   rosbag2_cpp/include/rosbag2_cpp/readers/sequential_reader.hpp
	modified:   rosbag2_cpp/test/rosbag2_cpp/test_multifile_reader.cpp
	modified:   rosbag2_storage/src/rosbag2_storage/impl/storage_factory_impl.hpp

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   rosbag2_cpp/src/rosbag2_cpp/readers/sequential_reader.cpp

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[emersonknapp]

Is this a real PR with the title "Draft", or should it actually be marked as a draft?

[MichaelOrlov]

@emersonknapp I added draft in title because it has unresolved conflicts after the mergify and not ready for review yet.
I was not able to find how to switch this PR to the draft.

[emersonknapp]

It's a hard-to-see button underneath "Reviewers" on the right bar

[MichaelOrlov]

• Closing as will not be backported since it has dependencies from Reverse read order API and sqlite storage implementation #1083 which has significant changes and breaking API/ABI compatibility.