feat(kit): add auto lineHeight for TuiLineClamp

[MillerSvt]

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Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

❗ No coverage uploaded for pull request base (v3.x@069a650). Click here to learn what that means.

Files	Patch %	Lines
.../kit/components/line-clamp/line-clamp.component.ts	14.28%	5 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             v3.x    #6806   +/-   ##
=======================================
  Coverage        ?   70.49%           
=======================================
  Files           ?     1097           
  Lines           ?    13116           
  Branches        ?     1859           
=======================================
  Hits            ?     9246           
  Misses          ?     3557           
  Partials        ?      313           

Flag	Coverage Δ
addon-charts	71.46% <ø> (?)
addon-doc	60.58% <ø> (?)
addon-mobile	60.63% <ø> (?)
addon-table	60.75% <ø> (?)
addon-tablebars	96.15% <ø> (?)
cdk	∅ <ø> (?)
core	77.63% <ø> (?)
kit	70.23% <14.28%> (?)
summary	70.49% <14.28%> (?)

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[waterplea]

We did this initially and it turned out to be very slow when there are multiple instances of it. I think we better not add this option. One day we will be able to use lh CSS units :harold_hides_the_pain: