[Feature/Question]: Exposing _resubscribeTopics

[olso-nordsec]

Hi,

When resubscribe=true, mqtt instance tracks resubscribe topics internally (hidden behind private field)

It would be helpful, if mqtt instance exposed a method e.g. getResubscribeTopics().

Wdyt?

[robertsLando]

I would instead create a getter (without the _ prefix). Would you mind to create a PR?

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