Add Jinja support for "indent" string filter (#19529)
* Add partial Jinja support for "indent" string filter
* Fully implement indent
* Add tests for all width variants.
* Update tests/test-jinja.cpp
Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@scala.com>
* Fix getline ignoring trailing newlines
* Update common/jinja/value.cpp
Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@scala.com>
* fix first indent condition
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Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@scala.com>
