Add statistics for handle_loaned_message (backport #1927)

[mergify]

This is an automatic backport of pull request #1927 done by Mergify.
Cherry-pick of 5c68830 has failed:

On branch mergify/bp/galactic/pr-1927
Your branch is up to date with 'origin/galactic'.

You are currently cherry-picking commit 5c688303.
  (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)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   rclcpp/include/rclcpp/subscription.hpp

no changes added to commit (use "git add" and/or "git commit -a")

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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[fujitatomoya]

@Barry-Xu-2018 template is different from humble, can you address the conflict?

[Barry-Xu-2018]

@Barry-Xu-2018 template is different from humble, can you address the conflict?

I will fix it.

[Barry-Xu-2018]

@fujitatomoya

I created a commit to fix this merge conflicts.
Barry-Xu-2018@47b892e

But I don't know to apply my fix.
I have no permission to push commit to this branch mergify/bp/galactic/pr-1927.

[clalancette]

But I don't know to apply my fix.
I have no permission to push commit to this branch mergify/bp/galactic/pr-1927.

You should be able to make a PR that targets this PR. Then we can merge it into this PR before doing the final review and test.

[Barry-Xu-2018]

But I don't know to apply my fix.
I have no permission to push commit to this branch mergify/bp/galactic/pr-1927.

You should be able to make a PR that targets this PR. Then we can merge it into this PR before doing the final review and test.

Get it. Thank you @clalancette

[fujitatomoya]

CI:

• Linux
• Linux-aarch64
• Windows

[fujitatomoya]

CI: sorry repo file path is not correct.

• Linux
• Linux-aarch64
• Windows

[fujitatomoya]

all green, i will go ahead to merge this.