feat: add TLS support for Keeper connections

[loomts]

Resolved #1311 , to simplify the config, I just reuse the tls config of clickhouse.
According to https://clickhouse.com/docs/operations/ssl-zookeeper, the sample use OS RootCAs, which can also be handle.

[Slach]

please add parsing /*/client/* from /var/lib/clickhouse/preprocessed_configs/config.xml
when isSecure true instead of using clickhouse TLS connection setting

moreover, could you add zookeeper and keeper tls settings to /tests/integration/docker-compose*.yml and /tests/integration/dynamic_settings.sh

and test it via
RUN_TESTS=^TestS3$ ./test/integration/run.sh

[Slach]

thanks you for your contribution

[coveralls]

Pull Request Test Coverage Report for Build 20569484255

Details

• 19 of 90 (21.11%) changed or added relevant lines in 3 files are covered.
• 274 unchanged lines in 11 files lost coverage.
• Overall coverage decreased (-1.8%) to 66.911%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/clickhouse/clickhouse.go	2	3	66.67%
pkg/utils/utils.go	8	25	32.0%
pkg/keeper/keeper.go	9	62	14.52%

Files with Coverage Reduction	New Missed Lines	%
pkg/backup/restore.go	1	71.75%
pkg/clickhouse/clickhouse.go	1	78.54%
cmd/clickhouse-backup/main.go	2	75.21%
pkg/storage/object_disk/object_disk.go	5	66.3%
pkg/config/config.go	8	72.64%
pkg/status/status.go	9	67.43%
pkg/server/server.go	11	58.54%
pkg/storage/general.go	12	61.02%
pkg/backup/backuper.go	17	70.95%
pkg/storage/s3.go	23	47.39%

Totals
Change from base Build 20459974961:	-1.8%
Covered Lines:	10952
Relevant Lines:	16368

---

💛 - Coveralls

[Slach]

@loomts any news about requested changes?

[loomts]

@loomts any news about requested changes?

@Slach I fixed according to the comments, PTAL.

[Slach]

thanks a lot for your contribution, looks great!