Provide code syntax hints/mappings for file extensions

[centminmod]

Sort of inline with #9 to add a feature to allow users to pair custom file extensions with specific code syntax highlighting.

Right now for my code base, I see code2prompt has a lot of wrapped code in unknown syntax highlighting

```unknown

For example, maybe there's a way to tell code2prompt that *.inc extension files have bash shell scripting so when it comes across *.inc extension files code it wraps it in

```bash

Wasn't sure about how that would be done so asked ChatGPT4o 🤓

1. Define a Command Line Argument for Mappings: Introduce a new command line argument, such as --syntax-map, which takes a list of mappings.
2. Specify Mappings in a Clear Format: Use a simple and clear format for specifying each mapping, for example, extension:syntax.
3. Handle Multiple Mappings: Allow users to specify multiple mappings separated by a comma or provide multiple --syntax-map arguments.

code2prompt --syntax-map "inc:bash,customext:python,ext2:javascript"

[raphaelmansuy]

Added in the roadmap.

[raphaelmansuy]

Will be released soon

[centminmod]

I see the readme has this updated usage example but --help for 0.8.1 doesn't show it from pipx install? and --analyze option is gone worked on 0.6.x versions

code2prompt --analyze --path $projectdir --gitignore $gitignoredir --suppress-comments --tokens --encoding $encoding --case-sensitive --output project_summary_analyze.md
Usage: code2prompt [OPTIONS] COMMAND [ARGS]...
Try 'code2prompt --help' for help.

Error: No such option: --analyze

pipx install code2prompt --force
Installing to existing venv 'code2prompt'
  installed package code2prompt 0.8.1, installed using Python 3.9.20
  These apps are now globally available
    - code2prompt
done! ✨ 🌟 ✨

code2prompt --help
Usage: code2prompt [OPTIONS] COMMAND [ARGS]...

  code2prompt CLI tool

Options:
  -v, --version                   Show the version and exit.
  --config FILE                   Path to configuration file
  -p, --path PATH                 Path(s) to the directory or file to process.
  -o, --output PATH               Name of the output Markdown file.
  -g, --gitignore PATH            Path to the .gitignore file.
  -f, --filter TEXT               Comma-separated filter patterns to include
                                  files (e.g., "*.py,*.js").
  -i, --interactive               Interactive mode to select files.
  -e, --exclude TEXT              Comma-separated patterns to exclude files
                                  (e.g., "*.txt,*.md").
  --case-sensitive                Perform case-sensitive pattern matching.
  -s, --suppress-comments         Strip comments from the code files.
  -ln, --line-number              Add line numbers to source code blocks.
  --no-codeblock                  Disable wrapping code inside markdown code
                                  blocks.
  -t, --template PATH             Path to a Jinja2 template file for custom
                                  prompt generation.
  --tokens                        Display the token count of the generated
                                  prompt.
  --encoding [cl100k_base|p50k_base|p50k_edit|r50k_base]
                                  Specify the tokenizer encoding to use.
  --create-templates              Create a templates directory with example
                                  templates.
  --log-level [DEBUG|INFO|WARNING|ERROR|CRITICAL]
                                  Set the logging level.
  --price                         Display the estimated price of tokens based
                                  on provider and model.
  --provider TEXT                 Specify the provider for price calculation.
  --model TEXT                    Specify the model for price calculation.
  --output-tokens INTEGER         Specify the number of output tokens for
                                  price calculation.
  --help                          Show this message and exit.

Commands:
  analyze   Analyze codebase structure
  generate  Generate markdown from code files