refactor(limiter): simplify limiter configuration

[lafirest]

Fixes EMQX-9813

after this refactor, the way to set node-level setting changed to:

limiter {
  max_conn_rate = "1000/s"  
  messages_rate = "100/s"
  bytes_rate = "100MB/s"
}

for listener-level:

listeners.tcp.default {
  max_conn_rate = "1000/s"  
  messages_rate = "100/s"
  bytes_rate = "100MB/s"
}

Summary

🤖 Generated by Copilot at 65228ec

Added a new HTTP API endpoint and a short path configuration feature for the node-level and listener-level rate limiter settings. Modified the emqx_limiter_schema, emqx_schema, and emqx_listeners modules to support the new features. Added and updated the i18n files for the limiter settings. Added test cases for the short path configuration feature.

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/{ce,ee}/(feat|perf|fix)-<PR-id>.en.md files
• 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
• Schema changes are backward compatible

Checklist for CI (.github/workflows) changes

• If changed package build workflow, pass this action (manual trigger)
• Change log has been added to changes/ dir for user-facing artifacts update

[coveralls]

Pull Request Test Coverage Report for Build 4911194714

• 22 of 29 (75.86%) changed or added relevant lines in 5 files are covered.
• 29 unchanged lines in 12 files lost coverage.
• Overall coverage increased (+0.03%) to 81.622%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
apps/emqx_management/src/emqx_mgmt_api_configs.erl	1	8	12.5%

Files with Coverage Reduction	New Missed Lines	%
apps/emqx_gateway/src/emqx_gateway_schema.erl	1	88.89%
apps/emqx_management/src/emqx_mgmt_util.erl	1	13.79%
apps/emqx/src/emqx_listeners.erl	1	85.71%
apps/emqx/src/emqx_message.erl	1	94.83%
apps/emqx/src/emqx_schema.erl	1	87.5%
apps/emqx/src/emqx_broker.erl	2	87.64%
apps/emqx/src/emqx_channel.erl	2	87.33%
apps/emqx/src/emqx_connection.erl	2	85.39%
apps/emqx/src/emqx_trace/emqx_trace.erl	2	88.18%
apps/emqx/src/emqx_flapping.erl	3	83.64%

Totals
Change from base Build 4910639718:	0.03%
Covered Lines:	26111
Relevant Lines:	31990

---

💛 - Coveralls

[HJianBo]

LGTM

[HJianBo]

limiter.messages_rate = "1000/s"