Refactor pom to use Pulsar BOM

[nicoloboschi]

• Use import instead of every single dep from LS
• Upgrade to LS 2.10 2.5

Shaded module diff

< [INFO]    +- org.apache.avro:avro:jar:1.9.0:compile
< [INFO]    +- com.fasterxml.jackson.core:jackson-core:jar:2.13.2:compile
< [INFO]    +- com.fasterxml.jackson.core:jackson-databind:jar:2.13.2.1:compile
< [INFO]    |  \- com.fasterxml.jackson.core:jackson-annotations:jar:2.13.2:compile
---
> [INFO]    +- org.apache.avro:avro:jar:1.10.2:compile
> [INFO]    +- com.fasterxml.jackson.core:jackson-core:jar:2.13.4:compile
> [INFO]    +- com.fasterxml.jackson.core:jackson-databind:jar:2.13.4.2:compile
> [INFO]    |  \- com.fasterxml.jackson.core:jackson-annotations:jar:2.13.4:compile
24c25
< [INFO]    +- com.google.guava:guava:jar:30.1-jre:compile
---
> [INFO]    +- com.google.guava:guava:jar:31.0.1-jre:compile
28c29
< [INFO]    |  +- org.checkerframework:checker-qual:jar:3.5.0:compile
---
> [INFO]    |  +- org.checkerframework:checker-qual:jar:3.12.0:compile
31,32c32
< [INFO]    \- org.slf4j:slf4j-api:jar:1.7.25:compile
< 
---
> [INFO]    \- org.slf4j:slf4j-api:jar:1.7.32:compile

Nar deps diff

(Using https://gist.github.com/nicoloboschi/d3e9a2de3175abc3fd7c13e9dd10187b)

Only in pulsar-snowflake-connector-0.1.13-alpha.nar/META-INF/bundled-dependencies/: guava-30.1-jre.jar
Only in pulsar-snowflake-connector-0.1.13-SNAPSHOT.nar/META-INF/bundled-dependencies/: guava-31.0.1-jre.jar
Only in pulsar-snowflake-connector-0.1.13-alpha.nar/META-INF/bundled-dependencies/: kafka-connect-avro-converter-shaded-2.10.2.4.jar
Only in pulsar-snowflake-connector-0.1.13-SNAPSHOT.nar/META-INF/bundled-dependencies/: kafka-connect-avro-converter-shaded-2.10.2.5.jar
Only in pulsar-snowflake-connector-0.1.13-alpha.nar/META-INF/bundled-dependencies/: netty-buffer-4.1.72.Final.jar
Only in pulsar-snowflake-connector-0.1.13-SNAPSHOT.nar/META-INF/bundled-dependencies/: netty-buffer-4.1.77.Final.jar
Only in pulsar-snowflake-connector-0.1.13-alpha.nar/META-INF/bundled-dependencies/: netty-common-4.1.72.Final.jar
Only in pulsar-snowflake-connector-0.1.13-SNAPSHOT.nar/META-INF/bundled-dependencies/: netty-common-4.1.77.Final.jar
Only in pulsar-snowflake-connector-0.1.13-alpha.nar/META-INF/bundled-dependencies/: pulsar-client-admin-api-2.10.2.4.jar
Only in pulsar-snowflake-connector-0.1.13-SNAPSHOT.nar/META-INF/bundled-dependencies/: pulsar-client-admin-api-2.10.2.5.jar
Only in pulsar-snowflake-connector-0.1.13-alpha.nar/META-INF/bundled-dependencies/: pulsar-client-api-2.10.2.4.jar
Only in pulsar-snowflake-connector-0.1.13-SNAPSHOT.nar/META-INF/bundled-dependencies/: pulsar-client-api-2.10.2.5.jar
Only in pulsar-snowflake-connector-0.1.13-alpha.nar/META-INF/bundled-dependencies/: pulsar-client-original-2.10.2.4.jar
Only in pulsar-snowflake-connector-0.1.13-alpha.nar/META-INF/bundled-dependencies/: pulsar-functions-api-2.10.2.4.jar
Only in pulsar-snowflake-connector-0.1.13-SNAPSHOT.nar/META-INF/bundled-dependencies/: pulsar-functions-api-2.10.2.5.jar
Only in pulsar-snowflake-connector-0.1.13-alpha.nar/META-INF/bundled-dependencies/: pulsar-io-core-2.10.2.4.jar
Only in pulsar-snowflake-connector-0.1.13-SNAPSHOT.nar/META-INF/bundled-dependencies/: pulsar-io-core-2.10.2.5.jar
Only in pulsar-snowflake-connector-0.1.13-alpha.nar/META-INF/bundled-dependencies/: pulsar-io-kafka-connect-adaptor-2.10.2.4.jar
Only in pulsar-snowflake-connector-0.1.13-SNAPSHOT.nar/META-INF/bundled-dependencies/: pulsar-io-kafka-connect-adaptor-2.10.2.5.jar
Only in pulsar-snowflake-connector-0.1.13-alpha.nar/META-INF/bundled-dependencies/: slf4j-api-1.7.25.jar
Only in pulsar-snowflake-connector-0.1.13-SNAPSHOT.nar/META-INF/bundled-dependencies/: slf4j-api-1.7.32.jar
Only in pulsar-snowflake-connector-0.1.13-alpha.nar/META-INF/bundled-dependencies/: snakeyaml-1.31.jar
Only in pulsar-snowflake-connector-0.1.13-SNAPSHOT.nar/META-INF/bundled-dependencies/: snakeyaml-1.32.jar
Only in pulsar-snowflake-connector-0.1.13-alpha.nar/META-INF/bundled-dependencies/: snowflake-kafka-connector-shaded-0.1-reduce-size.jar
Only in pulsar-snowflake-connector-0.1.13-SNAPSHOT.nar/META-INF/bundled-dependencies/: snowflake-kafka-connector-shaded-0.1.13-SNAPSHOT.jar