feat: implement multiple mentor support in groups

[aman-singh7]

Signed-off-by: Aman aman2@me.iitr.ac.in

Fixes #228

Describe the changes you have made in this PR -

Screenshots of the changes (If any) -

Note: Please check Allow edits from maintainers. if you would like us to assist in the PR.

[manjotsidhu]

@aman-singh7 Can you check if there a action that can automatically update podfile for us ?

[manjotsidhu]

Nice hack, in future if the action could also make a PR for podfile updates that would be better

[coveralls]

Pull Request Test Coverage Report for Build 2649532758

• 86 of 153 (56.21%) changed or added relevant lines in 12 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.5%) to 67.236%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
lib/ui/views/groups/my_groups_view.dart	5	6	83.33%
lib/services/API/group_members_api.dart	0	13	0.0%
lib/viewmodels/groups/group_details_viewmodel.dart	14	33	42.42%
lib/ui/views/groups/group_details_view.dart	35	69	50.72%

Totals
Change from base Build 2637822211:	-0.5%
Covered Lines:	4012
Relevant Lines:	5967

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 2649532758

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 86 of 153 (56.21%) changed or added relevant lines in 12 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.5%) to 67.236%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
lib/ui/views/groups/my_groups_view.dart	5	6	83.33%
lib/services/API/group_members_api.dart	0	13	0.0%
lib/viewmodels/groups/group_details_viewmodel.dart	14	33	42.42%
lib/ui/views/groups/group_details_view.dart	35	69	50.72%

Totals
Change from base Build 2637822211:	-0.5%
Covered Lines:	4012
Relevant Lines:	5967

---

💛 - Coveralls