libWARC | Add support for UUID generation (!6)

[Suhas K S]

Suhas K S created a merge request: 
https://gitlab.com/gnuwget/libwarc/-/merge_requests/6

Branches: uuid-generation to basic-setup
Author:    Suhas K S



## Design:
There are three methods to generate the UUID:

**1. Using `libuuid`:** This method is followed when `libuuid` is available and 
is the preferred method to generate the UUID.

**2. Using `uuid_create()` from `uuid.h`:** This method is followed when 
`libuuid` is not available.

**3. Using the fallback mechanism:** The file `uri.c` contains a fallback 
mechanism for generating the UUID using random numbers generated using 
`generate_random_number()`. This mechanism is a slightly modified version of 
the one used in Wget for the same purpose. The random number generation 
function is also a modified version of the `random_number()` function in 
`src/utils.c` from Wget. This method is not preferred if either of the above 
two methods are possible.

## Testing:
There is one automated test written to test the UUIDs generated by the above 
mechanisms. It essentially checks:
1. If the characters in the generated UUID string belong to the character set 
of UUID strings (`0-9`, `a-f` and `-`).
2. If the string follows the pattern: `8-4-4-4-12`.

Closes #6

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