CLI - Add helptext for --build-options

[bfops]

Description of Changes

Fix #1852.

API and ABI breaking changes

Nope

Expected complexity level and risk

1

Testing

New helptext below. Unfortunately, clap still shows the example using a space, but hopefully the helptext helps.

Usage: spacetime publish [OPTIONS] [name|address]

Arguments:
  [name|address]
          A valid domain or address for this database

Options:
  -c, --delete-data
          When publishing to an existing address, first DESTROY all data associated with the module

      --build-options <build_options>
          Options to pass to the build command, for example --build-options='--skip-println-checks'
          
          [default: ]

  -p, --project-path <project_path>
          The system path (absolute or relative) to the module project
          
          [default: .]

  -b, --bin-path <wasm_file>
          The system path (absolute or relative) to the compiled wasm binary we should publish, instead of building the project.

  -i, --identity <identity>
          The identity that should own the database. If no identity is provided, your default identity will be used.

      --anonymous
          Perform this action with an anonymous identity

  -s, --server <server>
          The nickname, domain name or URL of the server to host the database.

  -y, --yes
          Assume "yes" as answer to all prompts and run non-interactively

  -h, --help
          Print help (see a summary with '-h')

Run `spacetime help publish` for more detailed information.

[jdetter]

This looks excellent, thanks Zeke! 👍