Allow version-aware naming for artifact repositories (#1562)

For multiple `SCALA_VERSIONS` we will need to download artifacts for each version.
Some naming collision avoidance is needed.

Co-authored-by: mkuta <mkuta@virtuslab.com>

third_party/repositories/repositories.bzl

@@ -31,12 +31,14 @@ load(
 load(
     "@io_bazel_rules_scala//scala:scala_cross_version.bzl",
     "default_maven_server_urls",
+    "extract_major_version",
+    "version_suffix",
 )
 load(
     "@io_bazel_rules_scala//scala:scala_maven_import_external.bzl",
     _scala_maven_import_external = "scala_maven_import_external",
 )
-load("@io_bazel_rules_scala_config//:config.bzl", "SCALA_MAJOR_VERSION", "SCALA_VERSION")
+load("@io_bazel_rules_scala_config//:config.bzl", "SCALA_VERSION")
 
 artifacts_by_major_scala_version = {
     "2.11": _artifacts_2_11,
@@ -57,31 +59,42 @@ scala_version_by_major_scala_version = {
 }
 
 def repositories(
+        scala_version = None,
         for_artifact_ids = [],
         maven_servers = default_maven_server_urls(),
         overriden_artifacts = {},
         fetch_sources = True,
         validate_scala_version = False):
-    major_scala_version = SCALA_MAJOR_VERSION
+    """
+    Downloads given artifacts.
+
+    If `scala_version` is provided, artifacts will be downloaded for that Scala version.
+    Also version-aware naming of repositories will be used (appending a suffix).
+    Otherwise, the default Scala version is used and repository names have no suffix.
+    """
+
+    suffix = version_suffix(scala_version) if scala_version else ""
+    scala_version = scala_version or SCALA_VERSION
+    major_scala_version = extract_major_version(scala_version)
 
     if validate_scala_version:
-        repository_scala_version = scala_version_by_major_scala_version[SCALA_MAJOR_VERSION]
-        default_version_matches = SCALA_VERSION == repository_scala_version
+        repository_scala_version = scala_version_by_major_scala_version[major_scala_version]
+        default_version_matches = scala_version == repository_scala_version
 
         if not default_version_matches and len(overriden_artifacts) == 0:
             version_message = "Scala config (%s) version does not match repository version (%s)"
-            fail(version_message % (SCALA_VERSION, repository_scala_version))
+            fail(version_message % (scala_version, repository_scala_version))
 
     default_artifacts = artifacts_by_major_scala_version[major_scala_version]
     artifacts = dict(default_artifacts.items() + overriden_artifacts.items())
     for id in for_artifact_ids:
         _scala_maven_import_external(
-            name = id,
+            name = id + suffix,
             artifact = artifacts[id]["artifact"],
             artifact_sha256 = artifacts[id]["sha256"],
             licenses = ["notice"],
             server_urls = maven_servers,
-            deps = artifacts[id].get("deps", []),
+            deps = [dep + suffix for dep in artifacts[id].get("deps", [])],
             runtime_deps = artifacts[id].get("runtime_deps", []),
             testonly_ = artifacts[id].get("testonly", False),
             fetch_sources = fetch_sources,