feature/metrics-dashboard

[ndortega]

• Added a new internal metrics dashboard to track and display metrics in real-time
• filemounting functions (staticfiles and dynamicfiles) now include a loadfile() function which can be used to load and modify a file before it's registered with Oxygen

[codecov[bot]]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (c099267) 97.69% compared to head (29aa143) 97.25%.

Files	Patch %	Lines
src/core.jl	93.67%	5 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #138 +/- ## ========================================== - Coverage 97.69% 97.25% -0.44% ========================================== Files 12 13 +1 Lines 867 1020 +153 ========================================== + Hits 847 992 +145 - Misses 20 28 +8 ```

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