⚡️ implement connection pooling for clients

[Odonno]

Thank you for submitting this pull request! We appreciate you spending the time to work on these changes.

What does this change do?

SurrealDbClient pooling to avoid the cost of

1. WS reconnection when using the websocket engine
2. dropping and creating engines over and over, reducing memory pressure

The HTTP & embedded modes are not concerned as of now.

BREAKING CHANGES :

Scoped lifetime will now become the default as it should have been at the beginning. It is still possible to set another lifetime manually.

What is your testing strategy?

Integrations tests

Is this related to any issues?

Fixes #104

Have you read the Contributing Guidelines?

• I have read the Contributing Guidelines

[codecov]

Codecov Report

❌ Patch coverage is 64.64380% with 134 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.06%. Comparing base (6fd2105) to head (da24f55).
⚠️ Report is 68 commits behind head on main.

Files with missing lines	Patch %	Lines
SurrealDb.Net/Internals/SurrealDbEngine.Ws.cs	29.82%	36 Missing and 4 partials ⚠️
...DependencyInjection/ServiceCollectionExtensions.cs	66.23%	25 Missing and 1 partial ⚠️
...alDb.Net/Internals/ObjectPool/DefaultObjectPool.cs	41.66%	20 Missing and 1 partial ⚠️
...Db.Net/Internals/ObjectPool/SurrealDbClientPool.cs	72.85%	16 Missing and 3 partials ⚠️
SurrealDb.Net/SurrealDbClient.Methods.cs	83.33%	12 Missing ⚠️
SurrealDb.Net/Internals/SurrealDbEngine.Http.cs	79.31%	5 Missing and 1 partial ⚠️
...alDb.Embedded.Internals/SurrealDbEmbeddedEngine.cs	33.33%	4 Missing ⚠️
...et/Internals/ObjectPool/AsyncPooledObjectPolicy.cs	66.66%	1 Missing and 1 partial ⚠️
...ternals/ObjectPool/SurrealDbClientPoolContainer.cs	71.42%	0 Missing and 2 partials ⚠️
SurrealDb.Net/SurrealDbClient.Base.cs	75.00%	0 Missing and 1 partial ⚠️
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #208      +/-   ##
==========================================
+ Coverage   69.65%   71.06%   +1.41%     
==========================================
  Files         161      191      +30     
  Lines        6702     7943    +1241     
  Branches      775      838      +63     
==========================================
+ Hits         4668     5645     +977     
- Misses       1689     1963     +274     
+ Partials      345      335      -10     

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