chore: migrate httperrors to its own package

[remyleone]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 6.44172% with 305 lines in your changes are missing coverage. Please review.

Project coverage is 73.48%. Comparing base (4638e19) to head (3fe8e2c).

❗ Current head 3fe8e2c differs from pull request most recent head 4db04cc. Consider uploading reports for the commit 4db04cc to get more accurate results

Files	Patch %	Lines
scaleway/resource_lb.go	0.00%	3 Missing and 13 partials ⚠️
scaleway/resource_lb_ip.go	0.00%	9 Missing and 1 partial ⚠️
internal/httperrors/http.go	62.50%	9 Missing ⚠️
scaleway/resource_lb_backend.go	0.00%	8 Missing and 1 partial ⚠️
scaleway/resource_rdb_privilege.go	11.11%	8 Missing ⚠️
scaleway/resource_document_db_privilege.go	12.50%	7 Missing ⚠️
scaleway/resource_baremetal_server.go	0.00%	2 Missing and 4 partials ⚠️
scaleway/resource_container_namespace.go	0.00%	2 Missing and 4 partials ⚠️
scaleway/resource_instance_server.go	0.00%	1 Missing and 5 partials ⚠️
scaleway/resource_rdb_acl.go	0.00%	1 Missing and 5 partials ⚠️
... and 86 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2452      +/-   ##
==========================================
- Coverage   73.50%   73.48%   -0.03%     
==========================================
  Files         234      235       +1     
  Lines       35491    35491              
==========================================
- Hits        26089    26080       -9     
- Misses       7147     7156       +9     
  Partials     2255     2255              

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