Add an option to hide the detail of git merge

[ilan-schemoul]

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