Add an option to hide the detail of git merge

**Is your feature request related to a problem? Please describe.**
When I see the list of commits each merge commit shows the list of the merged commits. E.g: commit A is a merge commit of B,C,D. with "git log" I just see commit A, with lazygit I see commit A, B, C, D. I do not want that. I want to see only A because A contains easily 100s of commits.

**Describe the solution you'd like**
Option in C-l/yml config to not show the detail of a merge commit.

**Describe alternatives you've considered**
None

**Additional context**
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