feat: add trigger --recursive flag.

[i4ki]

What this PR does / why we need it:

Add a --recursive flag to terramate experimental trigger for triggering all stacks of a given base path.

Which issue(s) this PR fixes:

none

Special notes for your reviewer:

Does this PR introduce a user-facing change?

yes, adds a new feature.

[github-actions[bot]]

metric: time/op
CloudReadLines-4: old 1.01ms ± 4%: new 0.99ms ± 4%: delta: -2.11%
CloudReadLine-4: old 7.01ms ± 1%: new 7.01ms ± 2%: delta: 0.00%
ListFiles-4: old 53.3µs ± 1%: new 53.6µs ± 1%: delta: 0.72%
Generate-4: old 2.57s ± 2%: new 2.61s ± 1%: delta: 1.54%
GenerateRegex-4: old 1.71s ± 2%: new 1.73s ± 1%: delta: 0.97%
TokensForExpressionComplex-4: old 1.25ms ± 1%: new 1.25ms ± 1%: delta: 0.49%
TokensForExpressionPlainStringNoNewline-4: old 809ns ± 1%: new 813ns ± 1%: delta: 0.00%
TokensForExpressionStringWith100Newlines-4: old 21.7µs ± 1%: new 22.3µs ± 2%: delta: 2.78%
TokensForExpressionObjectWith100KeysWithNumberValues-4: old 1.44ms ± 1%: new 1.46ms ± 2%: delta: 0.93%
TokensForExpression-4: old 1.25ms ± 0%: new 1.27ms ± 1%: delta: 1.35%
PartialEvalComplex-4: old 577µs ± 0%: new 587µs ± 1%: delta: 1.63%
PartialEvalSmallString-4: old 3.62µs ± 0%: new 3.66µs ± 1%: delta: 0.87%
PartialEvalHugeString-4: old 1.88ms ± 0%: new 1.89ms ± 0%: delta: 0.66%
PartialEvalHugeInterpolatedString-4: old 4.93ms ± 1%: new 5.04ms ± 1%: delta: 2.38%
PartialEvalObject-4: old 24.2µs ± 0%: new 24.6µs ± 1%: delta: 1.90%
TmAllTrueLiteralList-4: old 6.29ms ± 1%: new 6.34ms ± 1%: delta: 0.74%
TmAllTrueFuncall-4: old 162µs ± 1%: new 163µs ± 1%: delta: 0.64%
TmAnyTrueLiteralList-4: old 147ms ± 0%: new 149ms ± 0%: delta: 1.22%
TmAnyTrueFuncall-4: old 161µs ± 1%: new 163µs ± 1%: delta: 1.34%
TmTernary-4: old 2.83µs ± 1%: new 2.86µs ± 1%: delta: 1.07%
TmTry-4: old 52.0µs ± 0%: new 52.7µs ± 1%: delta: 1.43%
metric: alloc/op
CloudReadLines-4: old 3.12MB ± 0%: new 3.12MB ± 0%: delta: 0.00%
CloudReadLine-4: old 3.37MB ± 0%: new 3.37MB ± 0%: delta: 0.00%
ListFiles-4: old 22.0kB ± 0%: new 22.0kB ± 0%: delta: -0.01%
Generate-4: old 2.32GB ± 0%: new 2.32GB ± 0%: delta: 0.00%
GenerateRegex-4: old 955MB ± 0%: new 955MB ± 0%: delta: 0.00%
TokensForExpressionComplex-4: old 404kB ± 0%: new 404kB ± 0%: delta: 0.00%
TokensForExpressionPlainStringNoNewline-4: old 512B ± 0%: new 512B ± 0%: delta: 0.00%
TokensForExpressionStringWith100Newlines-4: old 12.4kB ± 0%: new 12.4kB ± 0%: delta: 0.00%
TokensForExpressionObjectWith100KeysWithNumberValues-4: old 394kB ± 0%: new 394kB ± 0%: delta: 0.00%
TokensForExpression-4: old 404kB ± 0%: new 404kB ± 0%: delta: 0.00%
PartialEvalComplex-4: old 408kB ± 0%: new 408kB ± 0%: delta: 0.00%
PartialEvalSmallString-4: old 1.74kB ± 0%: new 1.74kB ± 0%: delta: 0.00%
PartialEvalHugeString-4: old 166kB ± 0%: new 166kB ± 0%: delta: 0.00%
PartialEvalHugeInterpolatedString-4: old 4.38MB ± 0%: new 4.38MB ± 0%: delta: 0.00%
PartialEvalObject-4: old 21.9kB ± 0%: new 21.9kB ± 0%: delta: 0.00%
TmAllTrueLiteralList-4: old 1.74MB ± 0%: new 1.74MB ± 0%: delta: 0.00%
TmAllTrueFuncall-4: old 45.5kB ± 0%: new 45.5kB ± 0%: delta: 0.00%
TmAnyTrueLiteralList-4: old 37.9MB ± 0%: new 37.9MB ± 0%: delta: 0.00%
TmAnyTrueFuncall-4: old 45.6kB ± 0%: new 45.6kB ± 0%: delta: 0.00%
TmTernary-4: old 1.20kB ± 0%: new 1.20kB ± 0%: delta: 0.00%
TmTry-4: old 11.2kB ± 0%: new 11.2kB ± 0%: delta: 0.00%
metric: allocs/op
CloudReadLines-4: old 5.54k ± 0%: new 5.54k ± 0%: delta: 0.00%
CloudReadLine-4: old 60.0k ± 0%: new 60.0k ± 0%: delta: 0.00%
ListFiles-4: old 321 ± 0%: new 321 ± 0%: delta: 0.00%
Generate-4: old 25.9M ± 0%: new 25.9M ± 0%: delta: 0.00%
GenerateRegex-4: old 18.6M ± 0%: new 18.6M ± 0%: delta: 0.00%
TokensForExpressionComplex-4: old 4.83k ± 0%: new 4.84k ± 0%: delta: 0.01%
TokensForExpressionPlainStringNoNewline-4: old 20.0 ± 0%: new 20.0 ± 0%: delta: 0.00%
TokensForExpressionStringWith100Newlines-4: old 227 ± 0%: new 227 ± 0%: delta: 0.00%
TokensForExpressionObjectWith100KeysWithNumberValues-4: old 3.19k ± 0%: new 3.19k ± 0%: delta: 0.00%
TokensForExpression-4: old 4.83k ± 0%: new 4.84k ± 0%: delta: 0.02%
PartialEvalComplex-4: old 3.65k ± 0%: new 3.65k ± 0%: delta: 0.00%
PartialEvalSmallString-4: old 23.0 ± 0%: new 23.0 ± 0%: delta: 0.00%
PartialEvalHugeString-4: old 35.0 ± 0%: new 35.0 ± 0%: delta: 0.00%
PartialEvalHugeInterpolatedString-4: old 23.1k ± 0%: new 23.1k ± 0%: delta: 0.00%
PartialEvalObject-4: old 153 ± 0%: new 153 ± 0%: delta: 0.00%
TmAllTrueLiteralList-4: old 13.6k ± 0%: new 13.6k ± 0%: delta: 0.00%
TmAllTrueFuncall-4: old 460 ± 0%: new 460 ± 0%: delta: 0.00%
TmAnyTrueLiteralList-4: old 252k ± 0%: new 252k ± 0%: delta: 0.00%
TmAnyTrueFuncall-4: old 462 ± 0%: new 462 ± 0%: delta: 0.00%
TmTernary-4: old 28.0 ± 0%: new 28.0 ± 0%: delta: 0.00%
TmTry-4: old 147 ± 0%: new 147 ± 0%: delta: 0.00%