Add samples mode

[vearutop]

No description provided.

[github-actions]

Lines Of Code

Language	Files	Lines	Code	Comments	Blanks	Complexity	Bytes
Go	9 (+1)	1939 (+277)	1462 (+188)	80 (+35)	397 (+54)	417 (+70)	44K (+8.2K)
Go (test)	3	458 (+384)	338 (+276)	24 (+24)	96 (+84)	114 (+104)	10.7K (+8.9K)

[github-actions]

Go API Changes

# summary
Inferred base version: v0.3.24
Suggested version: v0.4.0

[github-actions]

Unit Test Coverage

total: (statements) 42.4%
changed lines: (statements) 77.0%, coverage is less than 90.0%, consider testing the changes more thoroughly

Coverage of changed lines

File	Function	Coverage
Total		77.0%
cmd/catp/catp/app.go		100.0%
cmd/catp/catp/app.go:29	Main	100.0%
cmd/catp/catp/catp.go		97.5%
cmd/catp/catp/catp.go:272	scanFile	100.0%
cmd/catp/catp/catp.go:498	cat	96.6%
cmd/catp/catp/samples.go		64.1%
cmd/catp/catp/samples.go:22	trySampleSeekable	100.0%
cmd/catp/catp/samples.go:123	sampleNextMatch	81.9%
cmd/catp/catp/samples.go:188	writeMatch	78.6%
cmd/catp/catp/samples.go:202	sampleOutput	75.0%
cmd/catp/catp/samples.go:42	sampleSeekable	50.0%

Coverage diff with base branch

File	Function	Base Coverage	Current Coverage
Total		34.6%	42.4% (+7.8%)
cmd/catp/catp/app.go	Main	51.0%	56.3% (+5.3%)
cmd/catp/catp/catp.go	cat	74.5%	77.9% (+3.4%)
cmd/catp/catp/catp.go	openReader	30.0%	40.0% (+10.0%)
cmd/catp/catp/catp.go	scanFile	49.2%	67.1% (+17.9%)
cmd/catp/catp/samples.go	sampleNextMatch	no function	72.7%
cmd/catp/catp/samples.go	sampleOutput	no function	75.0%
cmd/catp/catp/samples.go	sampleSeekable	no function	52.3%
cmd/catp/catp/samples.go	trySampleSeekable	no function	100.0%
cmd/catp/catp/samples.go	writeMatch	no function	66.7%