crosslink: Add work command

[pellared]

Why

Fixes #309

Towards open-telemetry/opentelemetry-go#3964

go.work is honored by gopls language server so that develoeprs get better UX in tools like VSCode, Vim, Emacs etc

References:

• https://go.dev/ref/mod#workspaces
• https://go.dev/blog/get-familiar-with-workspaces
• https://go.dev/doc/tutorial/workspaces

Prior work: #308

What

Make crosslink to create/update the use in go.work file (if it exists).

Take notice that it will not harm any repositories which do not use Go workspaces. However developers could still use the functionality during development 😉

Testing

make gowork

created following go.work file

go 1.19

use (
	./checkdoc
	./chloggen
	./crosslink
	./dbotconf
	./
	./gotmpl
	./internal/tools
	./issuegenerator
	./multimod
	./semconvgen
)

[codecov]

Codecov Report

Patch coverage: 72.18% and project coverage change: +0.94 🎉

Comparison is base (6d04deb) 58.99% compared to head (ed6ce24) 59.93%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #311      +/-   ##
==========================================
+ Coverage   58.99%   59.93%   +0.94%     
==========================================
  Files          46       47       +1     
  Lines        2024     2134     +110     
==========================================
+ Hits         1194     1279      +85     
- Misses        698      715      +17     
- Partials      132      140       +8     

Impacted Files	Coverage Δ
crosslink/internal/config.go	81.25% <ø> (ø)
crosslink/internal/common.go	55.88% <50.00%> (-3.21%)	⬇️
crosslink/internal/graph.go	81.96% <54.54%> (+8.05%)	⬆️
crosslink/internal/work.go	75.78% <75.78%> (ø)
crosslink/cmd/root.go	73.33% <80.00%> (-0.09%)	⬇️

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