[BEAM-10875] Support NUMERIC in spanner schema parser

[terryxian78]

R: @chamikaramj, @nielm

Spanner library supports new column type NUMERIC since 1.59. We needs to support this type in spanner schema parser.

This issue is the follow-up task of the following PR :

4efc91b

NOTE:

I have run presubmit job and passed.
./gradlew spotlessApply && ./gradlew checkstyleMain checkstyleTest javadoc spotbugsMain compileJava compileTestJava

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Post-Commit Tests Status (on master branch)

Lang	SDK	Dataflow	Flink	Samza	Spark	Twister2
Go		---		---		---
Java
Python				---		---
XLang		---		---		---

Pre-Commit Tests Status (on master branch)

---	Java	Python	Go	Website	Whitespace	Typescript
Non-portable
Portable	---		---	---	---	---

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[nielm]

LGTM

[terryxian78]

ping, @chamikaramj, could you review this PR? Thanks!

[apilloud]

LGTM