Setup golangci-lint in full

[G-Rath]

I've opened #262 adding a basic configuration which is based off the one from osv-scanner, but due to type errors I've had to disable everything by default and manually re-enable specific rules - we should work towards getting all of the rules re-enabled, which'll include resolving the type error that I suspect is probably related to the protobuffer stuff.

Relates to #158

• containedctx (chore: enable containedctx linter #395)
• contextcheck (refactor: reuse existing context where possible #396)
• copyloopvar (refactor: enable copyloopvar linter #320)
• depguard
  • (this linter is only needed if we actually want to forbid something, so it's not a given that it needs to be enabled)
• dupl
• dupword (chore: enable dupword linter #321)
• errcheck
• errchkjson
• errname (chore: enable errname linter #394)
• errorlint
• exhaustive
• fatcontext
• forbidigo (test: forbid using t.Parallel #344)
  • (this linter is only needed if we actually want to forbid something, so it's not a given that it needs to be enabled)
• gochecknoinits (chore: enable gochecknoinits linter #288)
• gocritic
• gofmt (blocked by internal linter parity: chore: setup golangci-lint with a basic configuration #262 (comment))
• goimports (refactor: apply goimports linter #332)
• gosec
• gosimple
• govet
• inamedparam (refactor: name parameters in Cracker interface #334)
• ineffassign (refactor: enable ineffassign and wastedassign linters #289 / d3ab609)
• intrange (refactor: use integer-based ranges where possible #331)
• misspell (refactor: enable misspell linter #263)
• musttag (refactor: ensure that all fields in (un)marshaled structs have tags #393)
• nilerr (chore: enable nilerr linter #385)
• nilnil
• nlreturn
• noctx
• nosprintfhostport
• paralleltest
  • (we don't want to use t.Parallel, see test: forbid using t.Parallel #344)
• perfsprint
• prealloc
• predeclared (refactor: enable predeclared linter #299)
• protogetter
• revive
• staticcheck
• stylecheck
• thelper (test: ensure that t.Helper is used #325)
• tparallel
  • (we don't want to use t.Parallel, see test: forbid using t.Parallel #344)
• unconvert (refactor: remove unnecessary type conversions #333)
• unparam
• unused
• usestdlibvars
• wastedassign (refactor: enable ineffassign and wastedassign linters #289 / d3ab609)
• whitespace (refactor: enable whitespace linter #315)