refactor: multicall node_info to improve /node speed

[zhongwencool]

Getting all nodes' info API is too slow when there are many nodes in the cluster.
So replace rpc:call with erpc:multicall

[coveralls]

Pull Request Test Coverage Report for Build 3337214947

• 20 of 39 (51.28%) changed or added relevant lines in 3 files are covered.
• 35 unchanged lines in 12 files lost coverage.
• Overall coverage decreased (-0.07%) to 78.054%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
apps/emqx_management/src/proto/emqx_management_proto_v3.erl	4	10	40.0%
apps/emqx_management/src/emqx_mgmt.erl	15	28	53.57%

Files with Coverage Reduction	New Missed Lines	%
apps/emqx_modules/src/emqx_telemetry.erl	1	81.5%
apps/emqx/src/emqx_authentication_config.erl	1	83.62%
apps/emqx/src/emqx_connection.erl	1	87.36%
apps/emqx/src/emqx_listeners.erl	1	85.12%
apps/emqx/src/emqx_logger.erl	1	80.49%
apps/emqx/src/emqx_stats.erl	1	93.33%
apps/emqx_authn/src/emqx_authn.erl	2	75.0%
apps/emqx_resource/src/emqx_resource_manager.erl	2	87.75%
apps/emqx_management/src/proto/emqx_management_proto_v2.erl	4	20.0%
apps/emqx_management/src/emqx_mgmt_cli.erl	5	29.37%

Totals
Change from base Build 3335837932:	-0.07%
Covered Lines:	20863
Relevant Lines:	26729

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💛 - Coveralls

[zmstone]

LGTM otherwise.