Configure base branch name detection

[koalp]

Is your feature request related to a problem? Please describe.

I have base branches with other names than "main" and "master".
Currently, I have to manually configure them my repositories.

Describe the solution you'd like

I would like to be able to set a list of branch names that would be used to detect the base branche (base_branche_names = ["main", "master", "develop", "mycustomnamethatnobodyuses"]).

The base_branch function

neogit/lua/neogit/lib/git/branch.lua

Lines 125 to 136 in 63124cf

	function M.base_branch()
	local value = git.config.get("neogit.baseBranch")
	if value:is_set() then
	return value:read() ---@type string
	else
	if M.exists("master") then
	return "master"
	elseif M.exists("main") then
	return "main"
	end
	end
	end

would be modified to use this new parameter.

Describe alternatives you've considered
I could use a global neogit.baseBranch, but I would lose the autodetection of main and master