Add public getters for Node properties

[lorenzocerrone]

Feature requested in #12

Changes:

• implement three getter methods for the zarrs::Node struct

/// Returns a reference to the path of the node.
    #[must_use] 
    pub fn path(&self) -> &NodePath {
        &self.path
    }

    /// Returns a reference to the metadata of the node.
    #[must_use]
    pub fn metadata(&self) -> &NodeMetadata {
        &self.metadata
    }

    /// Returns a reference to the metadata of the node.
    #[must_use]
    pub fn children(&self) -> &Vec<Node> {
        &self.children
    }

• Derived clone traits for zarrs::Node and zarrs::node::NodeMetadata

[codecov]

Codecov Report

Attention: 9 lines in your changes are missing coverage. Please review.

Comparison is base (ef43dbb) 81.63% compared to head (61e41ab) 81.59%.

Files	Patch %	Lines
src/node.rs	0.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #13      +/-   ##
==========================================
- Coverage   81.63%   81.59%   -0.04%     
==========================================
  Files         127      127              
  Lines       18606    18615       +9     
==========================================
  Hits        15189    15189              
- Misses       3417     3426       +9     

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[LDeakin]

Thanks @lorenzocerrone and best of luck with your project!

[lorenzocerrone]

Awesome, thanks a lot!