Introduce 'artifacts.snapshot' that lists all artifacts brought in by 'artifacts.bzl' (#41)

## What is the goal of this PR?

We have introduced `artifacts.snapshot` that keeps track of the list of Maven artifacts brought in by `artifacts.bzl`, including the transitive dependencies. This would allow you to easily determine how many Maven dependencies are brought in.

Author: Ganeshwara Hananda

.circleci/config.yml

@@ -40,6 +40,11 @@ jobs:
       - install-bazel
       - run-bazel:
           command: bazel build //...
+      - run:
+          name: Verify dependencies/maven/artifacts.snapshot
+          command: |
+            dependencies/maven/update.sh
+            git diff --exit-code dependencies/maven/artifacts.snapshot
       - run: bazel run @graknlabs_dependencies//tool/unuseddeps:unused-deps -- list
 
   deploy-maven-snapshot:

WORKSPACE

@@ -51,6 +51,13 @@ load("@graknlabs_dependencies//builder/java:deps.bzl", java_deps = "deps")
 java_deps()
 load("@graknlabs_dependencies//library/maven:rules.bzl", "maven")
 
+# Load Kotlin
+load("@graknlabs_dependencies//builder/kotlin:deps.bzl", kotlin_deps = "deps")
+kotlin_deps()
+load("@io_bazel_rules_kotlin//kotlin:kotlin.bzl", "kotlin_repositories", "kt_register_toolchains")
+kotlin_repositories()
+kt_register_toolchains()
+
 # Load NodeJS
 load("@graknlabs_dependencies//builder/nodejs:deps.bzl", nodejs_deps = "deps")
 nodejs_deps()

dependencies/maven/artifacts.snapshot

@@ -0,0 +1,36 @@
+@maven//:com_google_android_annotations
+@maven//:com_google_android_annotations_4_1_1_4
+@maven//:com_google_api_grpc_proto_google_common_protos
+@maven//:com_google_api_grpc_proto_google_common_protos_1_12_0
+@maven//:com_google_code_findbugs_jsr305
+@maven//:com_google_code_findbugs_jsr305_3_0_2
+@maven//:com_google_code_gson_gson
+@maven//:com_google_code_gson_gson_2_7
+@maven//:com_google_errorprone_error_prone_annotations
+@maven//:com_google_errorprone_error_prone_annotations_2_3_2
+@maven//:com_google_guava_guava
+@maven//:com_google_guava_guava_23_0
+@maven//:com_google_j2objc_j2objc_annotations
+@maven//:com_google_j2objc_j2objc_annotations_1_1
+@maven//:com_google_protobuf_protobuf_java
+@maven//:com_google_protobuf_protobuf_java_3_5_1
+@maven//:io_grpc_grpc_api
+@maven//:io_grpc_grpc_api_1_24_1
+@maven//:io_grpc_grpc_context
+@maven//:io_grpc_grpc_context_1_24_1
+@maven//:io_grpc_grpc_core
+@maven//:io_grpc_grpc_core_1_24_1
+@maven//:io_grpc_grpc_protobuf
+@maven//:io_grpc_grpc_protobuf_1_24_1
+@maven//:io_grpc_grpc_protobuf_lite
+@maven//:io_grpc_grpc_protobuf_lite_1_24_1
+@maven//:io_grpc_grpc_stub
+@maven//:io_grpc_grpc_stub_1_24_1
+@maven//:io_opencensus_opencensus_api
+@maven//:io_opencensus_opencensus_api_0_21_0
+@maven//:io_opencensus_opencensus_contrib_grpc_metrics
+@maven//:io_opencensus_opencensus_contrib_grpc_metrics_0_21_0
+@maven//:io_perfmark_perfmark_api
+@maven//:io_perfmark_perfmark_api_0_17_0
+@maven//:org_codehaus_mojo_animal_sniffer_annotations
+@maven//:org_codehaus_mojo_animal_sniffer_annotations_1_17

dependencies/maven/update.sh

@@ -0,0 +1,3 @@
+#!/usr/bin/env sh
+
+bazel run @graknlabs_dependencies//library/maven:update