fastn code for standard library stuff

[siddhantk232]

The current implementation of fastn has this giant rust file that defines most of the standard library stuff (kernel components etc).

We should be able to use fastn language. The language should provide constructs that support development of kernel components and target specialised components (component just for terminal, or android etc) in fastn language as much as possible.

This is a wild idea to explore so I am just gathering thoughts on this one for now.

[amitu]

A lot of the giant rust file can trivially be converted to fastn code, eg all the records / or types etc we define. This is clearly a good idea, and we should implement it in 0.5.

[Arpita-Jaiswal]

We have done some of this for fastn module imported in FASTN.ftd file where the fastn.package, fastn.dependency etc are defined in ftd file.