Implement features and change version number

[GuiBL4]

Aim

This tasks aims to implement the feature system for Sleppa to implement conditional compilation. The goal is to provide several features :

• default : enables sleppa_primitives, sleppa_commit_analyzer, sleppa_configuration and sleppa_versioner
• changelog: enables sleppa_changelog
• release: enables sleppa_code_archiver
• notify: enables sleppa_notifier

Moreover, the versioning begins with 0.1.0 at the moment. While the crate is semver compatible, the version is provided by the packages uploaded either on GitHub package and crates.io.
Therefore, version on the Sleppa crate must be set at 0.0.0-semver in each Cargo.toml file. The version follows the tag in the GitHub repository.

Assumptions

• The version is given by the tag in the GitHub repository

Acceptance criteria

• Implements the four features
• Sets the version number to 0.0.0-semver in all Cargo.toml file to indicate the crate follows a semantic versioning.
• Sets the version in the main Cargo.toml to 0.0.0-semver, e.g. sleppa_primitives = { version = "0.0.0-semver", path = "crates/sleppa_primitives" }.

Risks

• No risk

Dependencies

• No dependencies

References

• cargo features: features and examples