EMQX 7751 support message properties

[sstrigler]

Fixes EMQX-7751

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PR Checklist

Please convert it to a draft if any of the following conditions are not met. Reviewers may skip over until all the items are checked:

• Added tests for the changes
• Changed lines covered in coverage report
• Change log has been added to changes/ dir
• For EMQX 4.x: appup files updated (execute scripts/update-appup.sh emqx)
• For internal contributor: there is a jira ticket to track this change
• If there should be document changes, a PR to emqx-docs.git is sent, or a jira ticket is created to follow up
• In case of non-backward compatible changes, reviewer should check this item as a write-off, and add details in Backward Compatibility section

Backward Compatibility

More information

[coveralls]

Pull Request Test Coverage Report for Build 3533708963

• 12 of 12 (100.0%) changed or added relevant lines in 1 file are covered.
• 35 unchanged lines in 9 files lost coverage.
• Overall coverage increased (+0.02%) to 78.108%

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Files with Coverage Reduction	New Missed Lines	%
apps/emqx/src/emqx_cm.erl	1	90.83%
apps/emqx_dashboard/src/emqx_dashboard_monitor.erl	1	69.44%
apps/emqx/src/emqx_broker_helper.erl	1	90.7%
apps/emqx_authz/src/emqx_authz_schema.erl	1	90.28%
apps/emqx/src/emqx_channel.erl	2	87.23%
apps/emqx/src/emqx_flapping.erl	3	80.85%
apps/emqx_management/src/emqx_mgmt_cli.erl	5	27.43%
apps/emqx/src/emqx_sys_mon.erl	5	86.46%
apps/emqx/src/emqx_reason_codes.erl	16	86.03%

Totals
Change from base Build 3532949846:	0.02%
Covered Lines:	20961
Relevant Lines:	26836

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💛 - Coveralls

The base branch was changed.

[zmstone]

need a rebase to resolve conflicts for the release notes.