refactor!: Remove Mode from FrontendOptions

[zyy17]

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?

Resolve #4399.

Remove Mode from FrontendOptions and determine whether it is Standalone or Distributed mode based on whether the Meta Client is configured.

Checklist

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

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[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 84.61%. Comparing base (7aae19a) to head (2cab7a5).
Report is 24 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4401      +/-   ##
==========================================
- Coverage   85.03%   84.61%   -0.43%     
==========================================
  Files        1075     1081       +6     
  Lines      192490   192908     +418     
==========================================
- Hits       163678   163222     -456     
- Misses      28812    29686     +874     

[sunng87]

Just realized that if user doesn't edit their config toml to remove this mode, will we throw an error for this "unknown" config item?

If so, this can be a breaking change. Perhaps we can keep it for a minor release and just change the behaviour

[zyy17]

Just realized that if user doesn't edit their config toml to remove this mode, will we throw an error for this "unknown" config item?

If so, this can be a breaking change. Perhaps we can keep it for a minor release and just change the behaviour

Make sense. Let's keep it.

[tisonkun]

serde typically ignores unknown fields. Do we assert unknown fields to failure anywhere?

[zyy17]

serde typically ignores unknown fields. Do we assert unknown fields to failure anywhere?

You are right. @sunng87, the Mode on the frontend is not always necessary for our released version. When the user uses the current version, they don't need to modify their original config file and don't throw unrecoverable errors.

[fengjiachun]

LGTM