HIVE-24958: Create new iceberg-catalog module

[marton-bod]

df80c15 - copy-pasting sources from iceberg-hive-metastore 0.11.x, this commit should not need a review
Please review: fff81a7 - Changes needed compared to Iceberg repo to make tests pass:

• Extra conf setting in TestHiveMetastore#initConf: fff81a7#diff-454838f58a7e8537062a492232ebeaff66cb75051a4d2591ce54bbd1a1779fa5R223
• Database location URI behaves differently in upstream Hive: fff81a7#diff-70672eb7a795f778b743e1965d02f66a0d4f918c551dadcefd9b4864e9a93522R555
  and fff81a7#diff-5173630509f49d2e68c1f0b06ea0d47166ff2e7dd0154bf24c763662546d90e6R405

Added the same checkstyle files as for iceberg-handler.
Moved AssertHelpers to iceberg-catalog test sources.
Deleted TestHiveMetastore from iceberg-handler (since it's already in iceberg-catalog) but ported over the changes from the previous commit.

[marton-bod]

@pvary @szlta @lcspinter can you please review? Thanks!

[lcspinter]

+1

[marton-bod]

Generally looks good to me.
A few nits only. Did we remove all the "hacks" we did for the iceberg-handler module which were needed until we have the metastore module?

Thanks for the review! Yes, the only hack we could remove with this one was this:
https://github.com/apache/hive/pull/2138/files#diff-9d31f72cca8ab08ae120d321c1b58816336936a23a4ef720ad65e79d3acbe743L357
(and also the removal of TestHiveMetastore from the handler module)
Most other hacks depend on Iceberg 0.12.0 coming out.