Option to write keys in bech32

[newhoggy]

Add the ability to output keys in bech32 format.

The functionality was extracted from #1979 and refactored to make #5016 easier to implement.

The functionality was extracted because there was concern about backwards compatibility in that PR. This PR implements the change in a backwards compatible way by introducing a new optional flag.

This PR is limited to the writing of bech32. The reading of bech32 is to be implemented separately to avoid making this PR to large.

Changes:

• Add --out-file argument to the shelley stake-pool id command.
• Add --key-format-output argument to the following commands:
  • address key-gen
  • stake-address key-gen
  • node key-gen
  • node key-gen-KES
  • node key-gen-VRF
  • genesis create-staked
  • genesis create

Depends on #5049, #5057 and #5059. Please review those first.

Before those are merged, it is recommended to review this PR commit-by-commit starting from the commit with the message "Rename OutputFormat to PoolIdOutputFormat for clarity"

[gitmachtl]

@newhoggy @disassembler the default for the --key-output-format is currently "text-envelope" (json), but the parameter help output for cardano-cli states that "bech32" is the default mode:

 --key-output-format STRING
                           Optional key output format. Accepted output formats
                           are "text-envelope" and "bech32" (default is
                           "bech32").