fix(router-lite): various overloads for the load method

[Sayan751]

Pull Request

📖 Description

This PR fixes the support for couple Router#load overloads.

• Viewport name with component class.
• Hierarchical viewport instruction with route-id as component.
• Promise as component for the load method. Typical use-case: import('./view-model').

🎫 Issues

👩‍💻 Reviewer Notes

📑 Test Plan

⏭ Next Steps

[codecov]

Codecov Report

Merging #1642 (6cbb8b4) into master (473441b) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1642      +/-   ##
==========================================
+ Coverage   87.73%   87.76%   +0.02%     
==========================================
  Files         240      240              
  Lines       22167    22168       +1     
  Branches     5005     5007       +2     
==========================================
+ Hits        19448    19455       +7     
+ Misses       2719     2713       -6     

Impacted Files	Coverage Δ
packages/router-lite/src/instructions.ts	88.26% <ø> (+2.26%)	⬆️
packages/router-lite/src/router.ts	93.20% <ø> (ø)
packages/router-lite/src/route-tree.ts	81.38% <100.00%> (+0.71%)	⬆️

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more