Implement channel_write_etc

[wangrunji0408]

• Pass all tests of channel_write_etc.
• Able to run microbenchmarks: Result

[github-actions]

Pull Request Test Coverage Report for Build 95384319

• 0 of 42 (0.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.2%) to 27.39%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
zircon-object/src/object/handle.rs	0	1	0.0%
zircon-syscall/src/channel.rs	0	41	0.0%

Totals
Change from base Build 95363677:	-0.2%
Covered Lines:	1507
Relevant Lines:	5502

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 95384319

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 42 (0.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.2%) to 27.39%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
zircon-object/src/object/handle.rs	0	1	0.0%
zircon-syscall/src/channel.rs	0	41	0.0%

Totals
Change from base Build 95363677:	-0.2%
Covered Lines:	1507
Relevant Lines:	5502

---

💛 - Coveralls