refactor: allow custom version

Walkthrough

The changes introduce a refactoring across various components of the codebase to consistently use a single VERSION constant sourced from hatsu_utils. This ensures uniformity in how version information is referenced, replacing multiple previous usages of environmental variables for versioning information with the centralized constant.

Changes

File Path	Change Summary
`crates/api_mastodon/src/entities/instance.rs`	Updated to use `VERSION` from `hatsu_utils` for instance version and description fields.
`crates/nodeinfo/src/schema.rs`	Updated to use the `VERSION` constant from `hatsu_utils` instead of `env!("CARGO_PKG_VERSION")` for the `version` field in `NodeInfoSoftware` struct.
`crates/utils/src/data.rs`	Modified import statement to include `VERSION` and replaced `env!("CARGO_PKG_VERSION")` with `VERSION` in the `info` function.
`crates/utils/src/lib.rs`	Added new `version.rs` module and exposed the `VERSION` constant.
`crates/utils/src/version.rs`	Introduced a public constant `VERSION` that retrieves the version from Cargo metadata.

Poem

In lines of code, where constants roam,
A version unified, now called home.
From hatsu_utils, it shines so bright,
Simplifying the code, making it right.
A single source, no more the strife,
For versions speak with a constant life.
🎉 🐇

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importantimport / hatsu