refactor: Refactor examples

[jakoschiko]

As a preparation for the Fragmentizer support in Python I want to refactor the existing examples.

After this PR there exists the following examples:

• fragmentizer.rs
  • Demonstrates the features of the Fragmentizer
  • Already exists
• client.rs
  • Demonstrates how a client can be implemented using Fragmentizer, GreetingCodec and ResponseCodec.
  • Reimplements imap-next
  • Added by this PR
• server.rs
  • Demonstrates how a server can be implemented using Fragmentizer, CommandCodec, AuthenticateDataCodec and IdleDoneCodec.
  • Reimplements imap-next
  • Added by this PR

The following examples will be removed:

• fragmentizer_client.rs
• fragmentizer_server.rs
• parse_greeting.rs
• parse_response.rs
• parse_command.rs

[coveralls]

Pull Request Test Coverage Report for Build 10408740639

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 92.981%

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Totals
Change from base Build 10256703767:	0.0%
Covered Lines:	11180
Relevant Lines:	12024

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💛 - Coveralls

[jakoschiko]

The fuzz check failed in the CI due to #590.

[duesee]

Any idea how to fix? We could slap a ignore on the lint and create an issue. I can then take a look later so we don't block on this.

[jakoschiko]

Just ignore it and wait for rust-lang/rust#129103 getting merged.

[duesee]

Boooring, everything works :P