Split endoflife.date and releasedata models in separate files (#276)

This makes the code easier to read.

src/docker_hub.py

@@ -1,6 +1,6 @@
 import sys
 
-from common import dates, endoflife, http
+from common import dates, endoflife, http, releasedata
 
 """Fetches releases from the Docker Hub API.
 
@@ -9,7 +9,7 @@ Unfortunately images creation date cannot be retrieved, so we had to use the tag
 METHOD = "docker_hub"
 
 
-def fetch_releases(p: endoflife.Product, c: endoflife.AutoConfig, url: str) -> None:
+def fetch_releases(p: releasedata.Product, c: endoflife.AutoConfig, url: str) -> None:
     data = http.fetch_url(url).json()
 
     for result in data["results"]:
@@ -24,7 +24,7 @@ def fetch_releases(p: endoflife.Product, c: endoflife.AutoConfig, url: str) -> N
 
 p_filter = sys.argv[1] if len(sys.argv) > 1 else None
 for product_name in endoflife.list_products(METHOD, p_filter):
-    product = endoflife.Product(product_name)
+    product = releasedata.Product(product_name)
     product_frontmatter = endoflife.ProductFrontmatter(product.name)
     for config in product_frontmatter.get_auto_configs(METHOD):
         fetch_releases(product, config, f"https://hub.docker.com/v2/repositories/{config.url}/tags?page_size=100&page=1")