Add AddTagTTL and AddEdgeTTL for Session Pool

[haoxins]

What type of PR is this?

• bug
• feature
• enhancement

What problem(s) does this PR solve?

Issue(s) number:

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How do you solve it?

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 57.14286% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 64.55%. Comparing base (5bfccb7) to head (56a5bbe).

Files	Patch %	Lines
session_pool.go	57.14%	4 Missing and 2 partials ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #323      +/-   ##
==========================================
- Coverage   64.59%   64.55%   -0.04%     
==========================================
  Files          11       11              
  Lines        2723     2737      +14     
==========================================
+ Hits         1759     1767       +8     
- Misses        817      821       +4     
- Partials      147      149       +2     

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[haoxins]

@Nicole00
Is there a way to check the TTL is set correctly?

[Nicole00]

@Nicole00 Is there a way to check the TTL is set correctly?

you can set the TTL_DURATION 5 for tag , insert some vertex for this tag.
And query the vertex after 5 seconds, if query result is empty, then your TTL is set correctly.
https://docs.nebula-graph.com.cn/3.6.0/3.ngql-guide/8.clauses-and-options/ttl-options/#tag_edge_type

[haoxins]

it works now

[Nicole00]

LGTM