Add Country Population Density and Gender Ratio Endpoints

[revanth1718]

I would like to enhance the Country Data functionality by adding new endpoints that provide additional demographic insights. Specifically, aim to introduce two new endpoints: one for calculating the population density of a country and another for determining the gender ratio. These endpoints will offer valuable data for users interested in detailed demographic statistics.

I am Participating in GSSOC'24.

[sonali9564]

dear PA,
Please assign this issue to me under GSSoc'24, I'm a contributor for GSSoC.
Looking forward to get assigned ASAP.

[ashitaprasad]

Existing endpoint can be modified

[aaviiothic]

hello! i would like to work for this issue. please assign it to me.

[shashbh18]

Please assign this issue to me.