Some pending review comments from previous PRs

[priyanshi-yb]

Describe the changes in this pull request

1. Changed the deep-copy library to github.com/jinzhu/copier as it looks more popular and maintained (last updated 6months ago). (comment from Fix: Do not redact password for conn pool connection uri while connecting to DB  #2203 )
2. Change the Stringbuilder.append to String.format() in java debezium exporter for MAP type conversion. (comment from Fix: MAP value converter for data via debezium #2156)

Describe if there are any user-facing changes

No

How was this pull request tested?

existing tests are enough
https://jenkins.dev.yugabyte.com/job/users/job/yb-voyager-testing/job/yb-voyager-testing-pipeline/4603/

Does your PR have changes that can cause upgrade issues?

Component	Breaking changes?
MetaDB	No
Name registry json	No
Data File Descriptor Json	No
Export Snapshot Status Json	No
Import Data State	No
Export Status Json	No
Data .sql files of tables	No
Export and import data queue	No
Schema Dump	No
AssessmentDB	No
Sizing DB	No
Migration Assessment Report Json	No
Callhome Json	No
YugabyteD Tables	No
TargetDB Metadata Tables	No