feat: add support for query attributes

[sidorares]

closes #4218

API examples:

// Send query attributes alongside a text query
const [rows] = await connection.query({
  sql: `SELECT
    mysql_query_attribute_string('trace_id') AS trace_id,
    mysql_query_attribute_string('attempt') AS attempt`,
  attributes: {
    trace_id: 'req-abc-123',
    attempt: 3
  }
});
// rows[0].trace_id === 'req-abc-123'
// rows[0].attempt  === '3'


// Attributes work alongside bind parameters
const [rows] = await connection.execute({
  sql: 'SELECT ? AS value, mysql_query_attribute_string(\'tag\') AS tag',
  values: [42],
  attributes: { tag: 'prepared-stmt' }
});
// rows[0].value === 42
// rows[0].tag   === 'prepared-stmt'

[codecov]

Codecov Report

❌ Patch coverage is 97.85408% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.69%. Comparing base (3f1ca9f) to head (2bdc12a).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/packets/query.js	95.12%	4 Missing ⚠️
lib/packets/encode_parameter.js	98.55%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4223      +/-   ##
==========================================
+ Coverage   90.64%   90.69%   +0.04%     
==========================================
  Files          86       87       +1     
  Lines       14245    14363     +118     
  Branches     1798     1822      +24     
==========================================
+ Hits        12913    13027     +114     
- Misses       1332     1336       +4     

Flag	Coverage Δ
compression-0	89.96% <97.85%> (+0.05%)	⬆️
compression-1	90.67% <97.85%> (+0.04%)	⬆️
static-parser-0	88.40% <97.85%> (+0.06%)	⬆️
static-parser-1	89.12% <97.85%> (+0.06%)	⬆️
tls-0	90.13% <97.85%> (+0.05%)	⬆️
tls-1	90.47% <97.85%> (+0.05%)	⬆️

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