feat: introduce the PluginOptions

[WenyXu]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

What's changed and what's your intention?

introduce the PluginOptions

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.

[fengjiachun]

LGTM

[waynexia]

Can we add something like PluginConfig in the config struct? It may look like

[[plugin.a]]
a1 = "xxx"
a2 = "xxx"

[[plugin.b]]
b1 = "xxx"
b2 = "xxx"

So every plugin can register and parse their options programly. And we won't duplicate the parsing step of config structs twice.

[codecov]

Codecov Report

Attention: Patch coverage is 43.75000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 83.92%. Comparing base (6d503b0) to head (735deb4).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4835      +/-   ##
==========================================
- Coverage   84.25%   83.92%   -0.33%     
==========================================
  Files        1129     1135       +6     
  Lines      208474   209496    +1022     
==========================================
+ Hits       175653   175828     +175     
- Misses      32821    33668     +847     

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