… and wording

…display name

This commit adds support for a custom type display map and scope display name to the changelog package. The `customTypeMap` property in the `ChangelogConfig` interface allows users to define a custom type display map, while the `scopeDisplayName` property allows users to specify a default display name for all scopes. These new features can be configured in the `customConfig.ts` file. This commit also includes some code refactoring and dependency updates.

…tScope in finalizeContext test

This commit refactors the code in finalizeContext index.test.ts file by using null instead of an empty string for subCommitScope. This change is done to fix a bug related to custom configuration scopeDisplayName. The commit does not add any new features nor affect performance.

…tTypes in customTypeMap parameter

This commit refactors the finalizeContext test in the changelog package by removing unused imports, variables, and commented-out code. It also improves readability by removing unnecessary ternary operations and renaming variables for clarity.

…template

This commit adds an option to show authors' avatars in the summary template of the changelog package. The new functionality is achieved by introducing a new handlebar partial called "summary-avatar," which contains the code that generates avatars for each author. The mainTemplate variable is updated to include this new partial and replace the {{gitUserInfo}} placeholder with the appropriate code based on the showAuthor and showAuthorAvatar options from the customConfig object.