Clickhouse SetupNormalize: changes to table definition

[Amogh-Bharadwaj]

This PR:

• Includes the peerdb_is_deleted column as a parameter of the ReplacingMergeTree engine
• Changes the variable name from signColName/Type to isDeletedColName/Type. Pretty sure signCol is for collapsing merge tree contexts.
• Changes the type of the peerdb_is_deleted column to UInt*, as that is needed to include it as param. Changed version column type to UInt64 from Int64, as it is always a positive value

Old definition:

CREATE TABLE default.public_test_table
(
    `id` Int32,
    `n` Decimal(10, 0),
    `_peerdb_synced_at` DateTime64(9) DEFAULT now(),
    `_peerdb_is_deleted` Int8,
    `_peerdb_version` Int64
)
ENGINE = ReplacingMergeTree(_peerdb_version)
PRIMARY KEY id
ORDER BY id
SETTINGS index_granularity = 8192

New definition:

CREATE TABLE default.public_test_table_new_definition
(
    `id` Int32,
    `_peerdb_synced_at` DateTime64(9) DEFAULT now64(),
    `_peerdb_is_deleted` UInt8,
    `_peerdb_version` UInt64
)
ENGINE = ReplacingMergeTree(_peerdb_version, _peerdb_is_deleted)
PRIMARY KEY id
ORDER BY id
SETTINGS index_granularity = 8192

• Functionally tested