libWARC | Add support for digest calculation (#7)

[Suhas K S]

Suhas K S created an issue: https://gitlab.com/gnuwget/libwarc/-/issues/7



## Design:
The currently proposed design in the discussion on issue #5 involves two 
methods:
- The **SHA1** implementation in the `crypto` module from gnulib(`crypto/sha1`).
- **Callback functions** so that the user can set his own implementation or any 
other library's implementation for the digest functions.

This issue is for further discussion on this subject and to track the 
implementation for digest calculation in libWARC.

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