ignores: Don't use strings.Contains

[abhinav]

Instead of matching for built-in functions with strings.Contains, use the parsed stack information to match function names exactly.

Following this change, the only remaining strings.Contains are to match on the goroutine state:

% rg strings.Contains
utils_test.go
84:             if strings.Contains(s.State(), "run") {

internal/stack/stacks_test.go
249:            if strings.Contains(s.State(), "run") {

Resolves #41 Depends on #111

[codecov[bot]]

Codecov Report

Merging #112 (78c5017) into master (91de685) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #112   +/-   ##
=======================================
  Coverage   98.50%   98.50%           
=======================================
  Files           6        6           
  Lines         334      334           
=======================================
  Hits          329      329           
  Misses          4        4           
  Partials        1        1           

Files	Coverage Δ
options.go	100.00% <100.00%> (ø)
tracestack_new.go	100.00% <100.00%> (ø)

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