Reduce number of dependencies for `@react-navigation/devtools` package

[sairus2k]

Switch to fast-deep-equal from deep-equal for @react-navigation/devtools package. By the way, fast-deep-equal already used in @react-navigation/native package.

Motivation

deep-equal is a terribly heavy library: https://npmgraph.js.org/?q=%40react-navigation%2Fdevtools

Test plan

Lint, typescript and tests are passed.

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