feat: create credentials command

[Sidharth-Singh10]

created a sub-command to create new ssh credentials and direct users to add them to their github.

In the flow discussed in the meet, the create-cred flow is supposed to run if all means of authentication fails, this can be achieved with the changes being introduced but I feel it would be better to inform the user to to run bgit create-creds instead of running the command then and there (when auth fails) and forcing the user for an extra step.

from my perspective, i think its better to keep the number of steps the user interacts with as minimal as possible.
Plus the auth could fail for plenty of other reasons the user may not be aware of or something user cannot fix.

Selecting existing key

Creating a new one

[codecov]

Codecov Report

❌ Patch coverage is 0% with 563 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/auth/create/ssh.rs	0.00%	241 Missing ⚠️
src/auth/git_ssh.rs	0.00%	188 Missing ⚠️
src/auth/ssh_utils.rs	0.00%	60 Missing ⚠️
src/auth/git_http.rs	0.00%	40 Missing ⚠️
src/auth/git_auth.rs	0.00%	25 Missing ⚠️
src/cmd/create_creds.rs	0.00%	3 Missing ⚠️
src/events/git_clone.rs	0.00%	1 Missing ⚠️
src/events/git_pull.rs	0.00%	1 Missing ⚠️
src/events/git_push.rs	0.00%	1 Missing ⚠️
src/main.rs	0.00%	1 Missing ⚠️
... and 2 more

Files with missing lines	Coverage Δ
src/cmd.rs	0.00% <ø> (ø)
src/events/git_clone.rs	0.00% <0.00%> (ø)
src/events/git_pull.rs	0.00% <0.00%> (ø)
src/events/git_push.rs	0.00% <0.00%> (ø)
src/main.rs	0.00% <0.00%> (ø)
src/workflows/default/prompt/pa07_ask_pull_push.rs	0.00% <0.00%> (ø)
src/workflows/default/prompt/pa13_pull_push.rs	0.00% <0.00%> (ø)
src/cmd/create_creds.rs	0.00% <0.00%> (ø)
src/auth/git_auth.rs	0.00% <0.00%> (ø)
src/auth/git_http.rs	0.00% <0.00%> (ø)
... and 3 more

... and 1 file with indirect coverage changes

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[rootCircle]

Instead of a sub command we can create a automated rule, that does it when not exists!