bug-fix(font-cache): Eliminated unwanted cloning of cosmic_text::fontdb::Database by passing it as a reference

[namana-mecha]

Objective

Fixes #70

Solution

cosmic_test::fontdb::Database was being cloned which was fixed by passing the FontCache itself as a mutable reference and making the changes accordingly.

Before

    fn caches(&self) -> Caches {
        Caches {
            font: Arc::new(RwLock::new(FontCache::new(self.fonts.clone()))),
        }
    }

After

    fn caches(&mut self) -> Caches {
        Caches {
            font: Arc::new(RwLock::new(&mut self.fonts_cache)),
        }
    }

Testing

Flamegraph of the code after the fix

[shoaibmerchant]

Nice work @namana-mecha can you address the comment, this might cause a lock condition