[Feature]: Refactor init to bootstrap examples

[paulotten]

Describe the feature

We currently bootstrap projects for various service integrations with hard-coded boilerplate code. The current implementation also generates the Cargo.toml with the latest available versions, which can be a problem: ‣

So for this project we should:

1. Investigate the viability of bootstrapping projects from examples in our examples repository: https://github.com/shuttle-hq/examples
2. Open a draft PR with a proof of concept
3. Update the cargo-shuttle cli to be able to init any example, not just hello-world for each integration.
4. Implement the refactor for all integrations

Suggestion or Example of how the feature would be used

No response

Duplicate declaration

• I have searched the issues and this feature has not been requested before.

[paulotten]

Plan for point 1 is to use include_str!.

[paulotten]

Draft #869 created. Questions for @oddgrd or another Shuttle dev:

1. Do you like the include_str! approach?

The current implementation also generates the Cargo.toml with the latest available versions, which can be a problem

2. Would you like me to just copy over the entire Cargo.toml file for each example? (Or would that cause some other issues?)

[paulotten]

Update the cargo-shuttle cli to be able to init any example, not just hello-world for each integration.

This is not currently implemented in #888. I'd recommend splitting it out to a separate issue. (Should be easy.)

[jonaro00]

@paulotten Do you want to work on the last part? If not, I can take it.

[paulotten]

@jonaro00 I'm fine with you taking the last part. Just let #888 get merged first.