[WIP]Inviting participant to participate in the challenge by Host

[Kajol-Kumari]

Feature Introduced through this PR:

• Host can now send an invitation to the participant for participating in his/her hosted challenge.

Work Done in this PR:

• Added Invite participant field in the challenge setting Tab

• Host can now send an invitation to the participant using their Email Id

work left to be done:

• Add the feature to let the participant accept the invitation using accept_challenge_invitation Api

• Add the required tests

GIF of feature added:

Note: This is a WIP Pr

[codecov-io]

Codecov Report

Merging #311 into master will decrease coverage by 0.30%.
The diff coverage is 22.64%.

@@            Coverage Diff             @@
##           master     #311      +/-   ##
==========================================
- Coverage   50.62%   50.31%   -0.31%     
==========================================
  Files          66       66              
  Lines        3771     3814      +43     
  Branches      444      451       +7     
==========================================
+ Hits         1909     1919      +10     
- Misses       1767     1800      +33     
  Partials       95       95              

Impacted Files	Coverage Δ
...e/challengesettings/challengesettings.component.ts	34.95% <21.56%> (-10.21%)	⬇️
src/app/services/endpoints.service.ts	64.58% <50.00%> (-0.32%)	⬇️
...bliclists/challengelist/challengelist.component.ts	47.57% <0.00%> (+0.97%)	⬆️

Impacted Files	Coverage Δ
...e/challengesettings/challengesettings.component.ts	34.95% <21.56%> (-10.21%)	⬇️
src/app/services/endpoints.service.ts	64.58% <50.00%> (-0.32%)	⬇️
...bliclists/challengelist/challengelist.component.ts	47.57% <0.00%> (+0.97%)	⬆️

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[Sanji515]

I think this is still an WIP PR, @Kajol-Kumari Please let us know when it is ready to review.