Split examples into binaries that are runnable independently

[prasannavl]

Feature Request

• We should make examples runnable individually easily.

Context

• Precursor: Tide core isolation revamp #219 (review)

Possible Implementation

• Have each example as separate bin (under examples/src/bin/), so that it can be easily run.

[k-nasa]

@prasannavl How about dividing crate one by one?　LIke actix/example
Then, I think that the dependency crates of the example becomes obvious.

[prasannavl]

@k-nasa - Personally, I like the convenience of switching between files quickly to be much nicer than having to go through a dir tree for simple examples.

[yoshuawuyts]

A bit of a different take here, but I really wish cargo run --example <name> would work. I don't think the solution in #227 is quite good enough, as it still breaks the default way of running examples.

# expected
$ cargo run --example <example_name>

# proposed in GH-227
$ cargo run -p examples --bin <example_name>

I think this might require moving tide from a member of the workspace, to the top level under src/. Which is similar to how we do it in Runtime.

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edit I've filed #247 as an alternative to #227, which brings back cargo run --example <example>.