Get event-related data in a non-failing way

Walkthrough

The recent changes primarily enhance error handling and improve feature management across various components. Key modifications include refining command line options, updating function return types to use Result for better error propagation, and adding the anyhow dependency for more robust error context management. These updates collectively aim to make the system more resilient and maintainable.

Changes

File Path	Change Summary
`examples/.env.sample`	Changed command line option from `--feature livenet` to `--features livenet`.
`odra-casper/livenet-env/src/livenet_contract_env.rs`	Modified `get_value` function to include `.ok()` for improved error handling.
`odra-casper/livenet-env/src/livenet_host.rs`	Updated `get_events_count` function to handle `None` case using `unwrap_or_default()`.
`odra-casper/rpc-client/Cargo.toml`	Added `anyhow` dependency version `1.0.86`.
`odra-casper/rpc-client/src/casper_client.rs`	Added `anyhow::Context` and `anyhow::Result` imports, and changed various function return types to `Result`.

Sequence Diagram(s) (Beta)

sequenceDiagram
    participant User
    participant LivenetContractEnv
    participant CasperClient

    User->>LivenetContractEnv: get_value()
    LivenetContractEnv->>CasperClient: get_value()
    CasperClient-->>LivenetContractEnv: Result<Value, Error>
    LivenetContractEnv-->>User: Option<Value>

    User->>LivenetHost: get_events_count()
    LivenetHost->>CasperClient: events_count()
    CasperClient-->>LivenetHost: Result<Option<u32>, Error>
    LivenetHost-->>User: u32 (using unwrap_or_default)

Poem

In code's deep forest, changes bloom, With anyhow to chase the gloom. From Option's nest to Result's flight, Error handling now feels right. Features toggled, commands refined, A smoother path for all to find. 🐇✨

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odradev / odra