Rework locale change

[Demivan]

Initialization code changed.
from:

const enBundle = new FluentBundle('en')
const ukBundle = new FluentBundle('uk')

const fluent = createFluentVue({
  locale: 'en',
  bundles: [enBundle, ukBundle] 
})

to:

const enBundle = new FluentBundle('en')
const ukBundle = new FluentBundle('uk')

const fluent = createFluentVue({
  bundles: [enBundle] 
})

Instead of using locale property to select current locale, bundles property is now used as current negotiated fallback chain of languages.

This allows consumers to choose language negotiation logic suitable for their app.

[codecov]

Codecov Report

Merging #625 (8ff3341) into develop (b10100d) will decrease coverage by 1.18%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #625      +/-   ##
===========================================
- Coverage    84.36%   83.18%   -1.19%     
===========================================
  Files           11       11              
  Lines          243      220      -23     
  Branches        37       35       -2     
===========================================
- Hits           205      183      -22     
  Misses          26       26              
+ Partials        12       11       -1     

Flag	Coverage Δ
vue-2	76.81% <100.00%> (-1.79%)	⬇️
vue-3	76.36% <100.00%> (-1.83%)	⬇️

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Impacted Files	Coverage Δ
packages/fluent-vue/src/TranslationContext.ts	100.00% <100.00%> (ø)
packages/fluent-vue/src/composition.ts	100.00% <100.00%> (+2.50%)	⬆️
packages/fluent-vue/src/getContext.ts	100.00% <100.00%> (ø)
packages/fluent-vue/src/index.ts	100.00% <100.00%> (ø)
packages/fluent-vue/src/vue/component.ts	89.65% <100.00%> (ø)
packages/fluent-vue/src/vue/directive.ts	76.08% <100.00%> (ø)

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