feat(metric-engine): support to write rows with sparse primary key encoding

[WenyXu]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

#5282

What's changed and what's your intention?

This PR introduces the ability for users to create physical tables with experimental sparse primary key encoding. There are two ways to enable this feature:

Table-Level Configuration

You can specify the sparse primary key encoding directly when creating a table:

CREATE TABLE greptime_physical_table (
    greptime_timestamp TIMESTAMP(3) NOT NULL,
    greptime_value DOUBLE NULL,
    TIME INDEX (greptime_timestamp)
) ENGINE = metric WITH (
    "physical_metric_table" = "",   
    "memtable.type" = "partition_tree",
    "memtable.partition_tree.primary_key_encoding" = "sparse"
);

Engine-Level Configuration

Alternatively, you can enable sparse primary key encoding at the engine level using the config.toml file:

[[region_engine]]
[region_engine.metric]
experimental_sparse_primary_key_encoding = true

PR Checklist

Please convert it to a draft if some of the following conditions are not met.

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.
• API changes are backward compatible.
• Schema or data changes are backward compatible.

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[fengjiachun]

Rest LGTM