…ult. (#4011) ## Description Iroh on esp32 is over 4 MiB out of the box, which means that it won't run on the majority of the esp32 devices out there. There are a number of deps we can get rid of without affecting core functionality. Portmapper is the easiest to feature gate since it is already disabled for wasm. Portmapper and its dep idg-next are big enough that when disabling it it barely fits on esp32 4 MiB devices. Implements #3811 ## Breaking Changes Builds that use no-default-features won't have the portmapper. This does not change APIs, but will change functionality. ## Notes & open questions In general, if a feature is disabled, should we stub the public API to just report 0/noops, or hide it? E.g. if you were to stub portmapper metrics you would not need to enable portmapper for our bench project. ## Change checklist  - [ ] Self-review. - [ ] Documentation updates following the [style guide](https://rust-lang.github.io/rfcs/1574-more-api-documentation-conventions.html#appendix-a-full-conventions-text), if relevant. - [ ] Tests if relevant. - [ ] All breaking changes documented. - [ ] List all breaking changes in the above "Breaking Changes" section. - [ ] Open an issue or PR on any number0 repos that are affected by this breaking change. Give guidance on how the updates should be handled or do the actual updates themselves. The major ones are: - [ ] [`quic-rpc`](https://github.com/n0-computer/quic-rpc) - [ ] [`iroh-gossip`](https://github.com/n0-computer/iroh-gossip) - [ ] [`iroh-blobs`](https://github.com/n0-computer/iroh-blobs) - [ ] [`dumbpipe`](https://github.com/n0-computer/dumbpipe) - [ ] [`sendme`](https://github.com/n0-computer/sendme)

feature: Option to enable/disable UPnP/PCP #3811

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