chore: polish release-please integration (#448)

* chore: ignore release-please generated files formatting

* chore: move changelog ul to * for consistency

* chore: allow 2 blank lines for release-please generated changelog

* style: change changelog date style to fit release-please style

* chore : configure release-please changelog style

Author: PierreJeanjacquot

.markdownlint.json

@@ -1,5 +1,8 @@
 {
   "default": true,
+  "MD012": {
+    "maximum": 2
+  },
   "MD013": false,
   "MD024": false,
   "MD033": {

.prettierignore

@@ -42,3 +42,5 @@ errors/**
 # generated files
 docs/
 src/common/generated
+CHANGELOG.md
+.release-please-manifest.json