- add support for configs to be provided from file and json

- define priority on the config json from YML, followed by file, last with the default value
  - Simplify code by merging configs right away
  - thanks for the suggestion @dtcMLOps

__tests__/configuration.test.ts

@@ -0,0 +1,17 @@
+import {mergeConfiguration, parseConfiguration, resolveConfiguration} from '../src/utils'
+
+jest.setTimeout(180000)
+
+it('Configurations are merged correctly', async () => {
+  const configurationJson = parseConfiguration(`{
+    "sort": "DESC",
+    "empty_template": "- no magic changes",
+    "trim_values": true
+}`)
+  const configurationFile = resolveConfiguration('', 'configs/configuration.json')
+
+  const mergedConfiguration = mergeConfiguration(configurationJson, configurationFile)
+
+  console.log(mergedConfiguration)
+  expect(JSON.stringify(mergedConfiguration)).toEqual(`{\"max_tags_to_fetch\":200,\"max_pull_requests\":1000,\"max_back_track_time_days\":1000,\"exclude_merge_branches\":[],\"sort\":\"DESC\",\"template\":\"$\{\{CHANGELOG}}\",\"pr_template\":\"- $\{\{TITLE}}\\n   - PR: #$\{\{NUMBER}}\",\"empty_template\":\"- no magic changes\",\"categories\":[{\"title\":\"## 🚀 Features\",\"labels\":[\"feature\"]},{\"title\":\"## 🐛 Fixes\",\"labels\":[\"fix\"]},{\"title\":\"## 🧪 Tests\",\"labels\":[\"test\"]}],\"ignore_labels\":[\"ignore\"],\"label_extractor\":[],\"transformers\":[],\"tag_resolver\":{\"method\":\"semver\"},\"base_branches\":[],\"custom_placeholders\":[],\"trim_values\":true}`)
+})