feat: support tracing rule sampler

[Taylor-lagrange]

I hereby agree to the terms of the GreptimeDB CLA

What's changed and what's your intention?

Implement a tracing sampler, the sampling rate of tracing can be determined based on different protocol and request_types of the protocol.

Current support protocol and request_types:

protocol	request_type
grpc	inserts/ query.sql / query.logical_plan / query.prom_range / query.empty / ddl.create_database / ddl.create_table / ddl.alter / ddl.drop_table / ddl.truncate_table / ddl.empty / deletes / row_inserts / row_deletes
mysql
postgres
otlp	metrics / traces
opentsdb
influxdb	write_v1 / write_v2
prometheus	remote_read/remote_write/format_query/instant_query/range_query/labels_query/series_query/label_values_query
http	sql / promql

User can config the tracing sampler rule by config like

[logging]
enable_otlp_tracing = true
otlp_endpoint = "localhost:4317"
# The percentage of tracing will be sampled and exported. Valid range `[0, 1]`, 1 means all traces are sampled, 0 means all traces are not sampled, the default value is 1. ratio > 1 are treated as 1. Fractions < 0 are treated as 0
[logging.tracing_sample_ratio]
default_ratio = 0.0
[[logging.tracing_sample_ratio.rules]]
protocol = "mysql"
ratio = 1.0
[[logging.tracing_sample_ratio.rules]]
protocol = "http"
request_types = ["sql"]
ratio = 0.3

The matching principle is to match rules one by one, and use the first match rule as the sampling rate. If no rules hit, the default ratio is used as the sampling rate.

At the entrance of each protocol&request_type, the corresponding fields are marked. The sampler matches these fields by rules, and finally determines the sampling rate of a certain protocol&request_type.

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR does not require documentation updates.

Refer to a related PR or issue link (optional)

[codecov]

Codecov Report

Attention: Patch coverage is 55.34591% with 71 lines in your changes are missing coverage. Please review.

Project coverage is 84.50%. Comparing base (8087822) to head (209903d).
Report is 27 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3405      +/-   ##
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- Coverage   85.74%   84.50%   -1.25%     
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  Files         893      900       +7     
  Lines      147207   148511    +1304     
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- Hits       126222   125497     -725     
- Misses      20985    23014    +2029     

[zhongzc]

LGTM