feat: flink sql add create space

[liuxiaocs7]

Try to close #62.

[codecov-commenter]

Codecov Report

Merging #66 (8e4435f) into master (93df7a1) will increase coverage by 11.82%. The diff coverage is 63.20%.

@@              Coverage Diff              @@
##             master      #66       +/-   ##
=============================================
+ Coverage     49.72%   61.54%   +11.82%     
- Complexity      190      291      +101     
=============================================
  Files            50       52        +2     
  Lines          1613     1784      +171     
  Branches        153      166       +13     
=============================================
+ Hits            802     1098      +296     
+ Misses          743      596      -147     
- Partials         68       90       +22     

Impacted Files	Coverage Δ
...onnector/nebula/catalog/AbstractNebulaCatalog.java	26.56% <33.33%> (+26.56%)	:arrow_up:
...ache.flink/connector/nebula/utils/NebulaSpace.java	47.05% <47.05%> (ø)
....flink/connector/nebula/catalog/NebulaCatalog.java	29.29% <57.81%> (+29.29%)	:arrow_up:
...che.flink/connector/nebula/utils/NebulaSpaces.java	91.30% <91.30%> (ø)
...ink/connector/nebula/utils/NebulaCatalogUtils.java	50.00% <100.00%> (+50.00%)	:arrow_up:
...e.flink/connector/nebula/utils/NebulaConstant.java	95.00% <100.00%> (+0.55%)	:arrow_up:
...ache.flink/connector/nebula/utils/NebulaUtils.java	74.60% <100.00%> (+2.67%)	:arrow_up:
...ebula/connection/NebulaMetaConnectionProvider.java	55.55% <0.00%> (ø)
...connector/nebula/table/NebulaRowDataConverter.java	59.52% <0.00%> (ø)
...nnector/nebula/connection/NebulaClientOptions.java	91.25% <0.00%> (+1.25%)	:arrow_up:
... and 12 more

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[liuxiaocs7]

Refer to Flink SQL doc and Nebula doc.

CREATE DATABASE [IF NOT EXISTS] [catalog_name.]db_name
  [COMMENT database_comment]
  WITH (key1=val1, key2=val2, ...)

CREATE SPACE [IF NOT EXISTS] <graph_space_name> (
    [partition_num = <partition_number>,]
    [replica_factor = <replica_number>,]
    vid_type = {FIXED_STRING(<N>) | INT[64]}
    )
    [COMMENT = '<comment>'];

I register the NebulaCatalog to flink table environment and use the catalog. Then execute create database statement will go to createDatabase method. In this method, we use graph client to execute create space ngql statement.

Test Environment:

Windows Virtual Machine(Centos7), Nebula is deployed by Docker.

And result is just as follow: