Normalise coordinate names (#1279)

* Allow gradle-style (`g:a:v:c@p`) coordinates to be used in `maven_install`

* Normalise naming of fields when unpacking coordinates across the repo

tests/unit/BUILD

diff --git a/tests/unit/BUILD b/tests/unit/BUILD
index 006537a..7fc251e 100644
--- a/tests/unit/BUILD
+++ b/tests/unit/BUILD
@@ -1,4 +1,5 @@
 load(":artifact_utilities_test.bzl", "artifact_utilities_test_suite")
+load(":coordinates_test.bzl", "coordinates_test_suite")
 load(":coursier_test.bzl", "coursier_test_suite")
 load(":coursier_utilities_test.bzl", "coursier_utilities_test_suite")
 load(":java_utilities_test.bzl", "java_utilities_test_suite")
@@ -9,6 +10,8 @@
 
 artifact_utilities_test_suite()
 
+coordinates_test_suite()
+
 coursier_test_suite()
 
 coursier_utilities_test_suite()