Provide easy default layer for TestServer

[987Nabil]

Currently the docs give this example list of layers to provide

}.provideSome[Client with Driver](TestServer.layer)
  }.provide(
    ZLayer.succeed(Server.Config.default.onAnyOpenPort),
    Client.default,
    NettyDriver.customized,
    ZLayer.succeed(NettyConfig.defaultWithFastShutdown),
  )

This is unnecessary complex. To just run a simple test, we should have something like TestServer.simple of type ZLayer[Any, Nothing, TestServer & Server], that gives a good default for most tests.

[jdegoes]

/bounty $50 for fix, test case, and documentation.

[algora-pbc]

💎 $50 bounty • ZIO

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Attempt	Started (GMT+0)	Solution
🟢 @987Nabil		#3161

[algora-pbc]

💡 @987Nabil submitted a pull request that claims the bounty. You can visit your bounty board to reward.

[algora-pbc]

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