Fix smart routing algorithm to select closest relay

[rablador]

Currently, smart routing picks a random DAITA relay. It should pick the closest relay using the haversine distance. It should group relays that are the same distance away and use the roulette wheel selection algorithm to pick one between the group of closest relays.

Also includes: update-the-relay-selector-wrapper-to-enable-smart-routing-ios-832

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This change is 

[linear]

IOS-830 Fix smart routing algorithm to select closest relay

[buggmagnet]

Reviewed 11 of 12 files at r1, all commit messages.
Reviewable status: 11 of 12 files reviewed, 1 unresolved discussion (waiting on @rablador)

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ios/MullvadREST/Relay/RelayPicking.swift line 132 at r1 (raw file):

            )
        } catch let error as NoRelaysSatisfyingConstraintsError where error.reason == .noDaitaRelaysFound {
            // If DAITA and smart routing are enabled and no supported relays are found, we should try to find the nearest

nit
Should we still refer to the feature as "Smart routing" ? 🤔

[rablador]

Reviewable status: 11 of 12 files reviewed, 1 unresolved discussion (waiting on @buggmagnet)

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ios/MullvadREST/Relay/RelayPicking.swift line 132 at r1 (raw file):

Previously, buggmagnet wrote…

nit
Should we still refer to the feature as "Smart routing" ? 🤔

Nope!

[buggmagnet]

Reviewed 1 of 1 files at r2, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion

[github-actions]

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