db_utils/db_creation.py: change distance data type from varchar to float

src/db_utils/db_creation.py

@@ -147,7 +147,7 @@ def create_cin_gene_interaction_table(conn: sqlite3.Connection) -> None:
                 [gene2] INT NOT NULL,
                 [id_project] INT NOT NULL,
                 [level] VARCHAR(25) NOT NULL,
-                [distance] VARCHAR(30),
+                [distance] FLOAT,
                 PRIMARY KEY ([id]),
                 FOREIGN KEY ([gene1]) REFERENCES cin_gene([id]),
                 FOREIGN KEY ([gene2]) REFERENCES cin_gene([id]),