Add file reading and writing

[GregTheGreek]

New Features:

• Writing strings to files
• Reading file contents into a string
• Return home directory
• Parsing .toml to struct

Tests:

• Cover all the above
• Added helper method to perform a cleanup of tested files

Misc:

• Reorganized clock tests under node/tests rather than being in the respective module
• Marked certain methods under clock public

[ansermino]

Please add toml support, we don't really need to read strings afaik.

[ec2]

I think this might be for things like saving the peerID of yourself to a file?

[GregTheGreek]

That is correct, I'll also add toml support

[austinabell]

You didn't include this module in the lib.rs so it wasn't being compiled/tested.

Add:

pub mod utils;

to the node/src lib.rs file. You'll notice there are a few linting issues with private functions not being used

[ansermino]

I think this might be for things like saving the peerID of yourself to a file?

Afaik keys are stored in raw bytes not strings

[GregTheGreek]

Afaik keys are stored in raw bytes not strings

It doesn't seem we're actually using the key, rather only using the pubkey as a way to self identify. Which from what I know can be stored as a string
https://github.com/ChainSafe/ferret/blob/c03f05bcff6d88fb59f2037d7c07ce0cbc70a3db/node/ferret-libp2p/src/service.rs#L24

[ec2]

besides type as austin pointed out, lgtm