[TASK] Prevent word truncation with enabled resultsHighlighting

[loeffe1]

What this pr does

Use BreakIteratorBoundaryScanner instead of SimpleBoundaryScanner

This is a basic proof of concept for english and german cores

How to test

Enable highlighting

Fixes: #4091

[dkd-kaehm]

Apache Solr can't boot up fully, therefore no integration tests possible...
Configured for HL-BS cores only can boot:

...
Caused by: org.apache.solr.common.SolrException: No system property or default value specified for hl.bs.language value:
...

See attached log:
solr.log

@loeffe1
Could you please attach remaining cores as well, or temporary disable all cores except following, which are required for tests.

• de
• da
• en

ext-solr/Build/Test/cibuild_docker.sh

Lines 34 to 73 in 2b7b956

	AVAILABLE_CORES=(
	"core_de"
	"core_en"
	"core_ar"
	"core_hy"
	"core_eu"
	"core_ptbr"
	"core_my"
	"core_ca"
	"core_zh"
	"core_cs"
	"core_da"
	"core_nl"
	"core_fi"
	"core_fr"
	"core_gl"
	"core_el"
	"core_hi"
	"core_hu"
	"core_id"
	"core_it"
	"core_ja"
	"core_km"
	"core_ko"
	"core_lo"
	"core_no"
	"core_fa"
	"core_pl"
	"core_pt"
	"core_ro"
	"core_ru"
	"core_es"
	"core_sv"
	"core_th"
	"core_tr"
	"core_uk"
	"core_rs"
	"core_ie"
	"core_lv"
	)