Investigate Configurable Entry Type and Regular Expression Entry Checks

[bflad]

Description

Consumers of go-changelog may wish to use changelog-pr-body-check in pull request workflows with slightly more configurable entry type checking and other functionality such as expected entry prefixes/regular expressions for certain types. While the goal would not be to create too complex of a configuration for the tooling, there could be some broadly beneficial updates that could potentially be made.

References

• Add CHANGELOG file contents linting terraform-provider-aws#17135