refactor: redesign compilation process

[siyul-park]

redesigning the compilation process, reducing the convoluted responsibilities in the Loader and transferring the linking process to a symbol table. To achieve this, we introduce a new symbol object that binds Specs and Nodes. Additionally, we remove the unnecessary Unload operation in the loader.

[codecov]

Codecov Report

Attention: 80 lines in your changes are missing coverage. Please review.

Comparison is base (b391d5d) 62.47% compared to head (17ead0a) 63.56%.

❗ Current head 17ead0a differs from pull request most recent head 4709006. Consider uploading reports for the commit 4709006 to get more accurate results

Files	Patch %	Lines
pkg/symbol/table.go	78.35%	24 Missing and 18 partials ⚠️
pkg/loader/loader.go	63.63%	16 Missing and 12 partials ⚠️
pkg/symbol/loadhook.go	0.00%	3 Missing ⚠️
pkg/symbol/unloadhook.go	0.00%	3 Missing ⚠️
pkg/hook/hook.go	80.00%	0 Missing and 2 partials ⚠️
pkg/loader/reconciler.go	85.71%	0 Missing and 1 partial ⚠️
pkg/runtime/runtime.go	93.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #10      +/-   ##
==========================================
+ Coverage   62.47%   63.56%   +1.08%     
==========================================
  Files          77       76       -1     
  Lines        6687     6524     -163     
==========================================
- Hits         4178     4147      -31     
+ Misses       1914     1803     -111     
+ Partials      595      574      -21     

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