Replace SeaORM's ColumnType and IdenStatic with its SeaQuery's counterparts

[billy1624]

PR Info

• Closes Replace SeaORM's ColumnType and IdenStatic with its SeaQuery's counterparts #1387

• Dependencies

  • Supporting types and implementations for replacing SeaORM's ColumnType sea-query#579

Breaking Changes

• Changed the return type of EntityName::table_name to be &'static str

impl EntityName for Entity {
-   fn table_name(&self) -> &str {
+   fn table_name(&self) -> &'static str {
        "fruit"
    }
}

• sea_orm::IdenStatic was replaced by sea_query::IdenStatic
• Identity was being moved into sea_query
• IntoIdentity was being moved into sea_query
• sea_orm::ColumnType was replaced by sea_query::ColumnType
• ColumnType::Custom takes sea_query::DynIden instead of String

// Compact Entity
#[derive(Clone, Debug, PartialEq, Eq, DeriveEntityModel)]
#[sea_orm(table_name = "fruit")]
pub struct Model {
-   #[sea_orm(column_type = r#"Custom("citext".to_owned())"#)]
+   #[sea_orm(column_type = r#"custom("citext")"#)]
    pub column: String,
}

// Expanded Entity
impl ColumnTrait for Column {
    type EntityName = Entity;

    fn def(&self) -> ColumnDef {
        match self {
-           Self::Column => ColumnType::Custom("citext".to_owned()).def(),
+           Self::Column => ColumnType::custom("citext").def(),
        }
    }
}

• ColumnType::Binary became a tuple variant which take sea_query::BlobSize
• Methods ColumnType::def was being moved into ColumnTypeTrait

[billy1624]

This PR was being splitted into two:

• Replace SeaORM's ColumnType #1395
• Replace SeaORM's IdenStatic #1396