[ios] Fix kernel bundles not being versioned

[ios] store OTA updates in Application Support directory (#5336)

[ios] remove legacy naming in EXManifestResource and EXCachedResource

stop appending index.exp to non exp.host urls (#3003)

* [ios] remove index.exp from manifest request, add exp to Accept header request

* exp->expo, also accept json

* change manifest cache path to

stop appending index.exp to non exp.host urls (#3003)

* [ios] remove index.exp from manifest request, add exp to Accept header request

* exp->expo, also accept json

* change manifest cache path to original url, make legacy cache paths accessible in subclasses

* pr feedback

fbshipit-source-id: 91e8f02

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prefer manifest from NSBundle over cache if it has a newer publishedTime (#2452)

fbshipit-source-id: 6bb297d

Organize AppLoader, fix AppLoader tests

fbshipit-source-id: e80e891