[TASK] Simplify light client relayer configuration

[salman01zp]

Overview

Simplyfy configuration, we can divide config into three parts

• LightClientRelayerConfig
• BeaconChainConfig
• TangleSubstrateConfig

and set default values for most of the values and just pass simple single configuration file

#[derive(Debug, Clone, Deserialize, Serialize, Default)]
#[serde(rename_all(serialize = "camelCase", deserialize = "kebab-case"))]
pub struct LightClientRelayerConfig {
    pub tangle_config : TangleSubstrateConfig,
    pub beacon_chain_config : BeaconChainConfig,
    // endpoint for the Ethereum full node, which supports Eth1 RPC API
    pub eth1_endpoint: String,
    pub get_light_client_update_by_epoch: Option<bool>,
    // the max number of headers submitted in one batch to eth client
    pub headers_batch_size: u32,
    
}

#[derive(Debug, Clone, Deserialize, Serialize, Default)]
#[serde(rename_all(serialize = "camelCase", deserialize = "kebab-case"))]
pub struct BeaconChainConfig {
    pub name: String,
    // Beacon http endpoint
    #[serde(skip_serializing)]
    pub http_endpoint: RpcUrl,
    // Beacon rpc version (V1_1, V1_2)
    pub beacon_rpc_version: BeaconRPCVersion,
    // sleep time on sync
    pub sleep_time_on_sync_secs: u64,

}

#[derive(Debug, Clone, Deserialize, Serialize, Default)]
#[serde(rename_all(serialize = "camelCase", deserialize = "kebab-case"))]
pub struct TangleSubstrateConfig {
    /// String that groups configuration for this chain on a human-readable name.
    pub name: String,
    /// Websocket Endpoint for long living connections
    #[serde(skip_serializing)]
    pub ws_endpoint: RpcUrl,
    #[serde(skip_serializing)]
    pub suri: Option<Suri>,
}