Process project name to make it a valid Java identifier

[ramnivas]

If the specified project name contains -s, the created sources have an invalid package and class names. I believe this is also the case with other disallowed characters or other rules such as starting with a digit.

1. Package name

$ uvx --from git+https://github.com/embabel/project-creator.git project-creator

📚 Available template repositories:
  1. Kotlin Agent Template - Kotlin agent template - https://github.com/embabel/kotlin-agent-template
  2. Java Agent Template - Java agent template - https://github.com/embabel/java-agent-template

Select repository (1-2) [default: 1]: 2
✅ Selected: Java Agent Template
Project name: film-em-exograph-mcp
Package name (default: com.example.film-em-exograph-mcp): 

Here the package name should be processed to either drop -s or replace them with _ to make it a valid identifier.

2. Class name

I overrode the suggested default with film_exograph_exograph_mcp. This still resulted in invalid class name: Film-em-exograph-mcpApplication.