Remove Unecessary Serde Renames

[StPfeffer]

There is too many usages of the #[serde(rename = "newName")], all of this can be replaced to a singles #[serde(rename_all = "camelCase")] before the struct definition.

For example, the RegisterCountryDTO:

#[derive(Validate, Debug, Default, Clone, Serialize, Deserialize)]
pub struct RegisterCountryDTO {
    #[validate(length(
        min = 1,
        max = 100,
        message = "Country name must have a maximum of 100 characters"
    ))]
    pub name: String,

    #[validate(length(min = 2, max = 2, message = "Alpha 2 code must be 2 characters long"))]
    #[serde(rename = "alpha2")]
    pub alpha_2: String,

    #[validate(length(min = 3, max = 3, message = "Alpha 3 code must be 3 characters long"))]
    #[serde(rename = "alpha3")]
    pub alpha_3: String,

    #[validate(length(min = 3, max = 3, message = "Numeric 3 code must be 3 characters long"))]
    #[serde(rename = "numeric3")]
    pub numeric_3: String,
}

Uses the #[serde(rename = "")] in three places, and can be replaced by:

#[derive(Validate, Debug, Default, Clone, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct RegisterCountryDTO {
    #[validate(length(
        min = 1,
        max = 100,
        message = "Country name must have a maximum of 100 characters"
    ))]
    pub name: String,

    #[validate(length(min = 2, max = 2, message = "Alpha 2 code must be 2 characters long"))]
    pub alpha_2: String,

    #[validate(length(min = 3, max = 3, message = "Alpha 3 code must be 3 characters long"))]
    pub alpha_3: String,

    #[validate(length(min = 3, max = 3, message = "Numeric 3 code must be 3 characters long"))]
    pub numeric_3: String,
}