Move ICANN activity report BigQuery SQL code to opensource repo

This migrates the IcannReportQueryBuilder part of the internal ICANN reporting
script into the opensource repository, as a new module under the package
google.registry.reporting.

It correspondingly moves the golden activity SQL query test to the opensource
repo, since that test only applies to this part of the script anyway (note that
the actual golden SQL contents is unchanged by the move).

Tested: confirmed that the newly moved test passes (and that it also fails when
expected as well), and ran the internal icann reporting script locally to verify
that both activity and transaction reporting results are unaffected by the move.
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=127580326

python/google/registry/reporting/BUILD

@@ -0,0 +1,18 @@
+package(default_visibility = ["//java/google/registry:registry_project"])
+
+licenses(["notice"])  # Apache 2.0
+
+
+py_library(
+    name = "icann_report_query_builder",
+    srcs = ["icann_report_query_builder.py"],
+    deps = ["//python:python_directory_import"],
+)
+
+py_test(
+    name = "icann_report_query_builder_test",
+    size = "small",
+    srcs = ["icann_report_query_builder_test.py"],
+    data = ["testdata/golden_activity_query.sql"],
+    deps = [":icann_report_query_builder"],
+)