Export WriteAdapter method

[skolodyazhnyy]

Sometimes you have to break abstraction for whatever reason and get to underlying SQL connection. With standard SQL adapter you can get database connection using Adapter method in rel.Repository.

repo.Adapter(ctx).(*sql.SQL).DB

But if your SQL adapter is wrapped into primaryreplica it becomes impossible to access underlying connection.

As a suggestion, in this PR I've exported WriteAdapter() method which allows to get access to primary adapter (connection).

It's a little bit cumbersome

pr := repo.Adapter(ctx).(*primaryreplica.PrimaryReplica)
db := pr.WriteAdapter().(*sql.SQL).DB

But it allows to implement a workaround or execute very exotic query otherwise not supported by Repository API.

It probably would make sense to open up ReadAdapter() too, but I wanted to keep changes to a minimum.

As a context, in my case I'm trying to make aggregation by a float (decimal) field which is not supported by Repository yet.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (5eb196d) 100.00% compared to head (e669f00) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #26   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           31        31           
=========================================
  Hits            31        31           

Files Changed	Coverage Δ
primary_replica.go	100.00% <100.00%> (ø)

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[Fs02]

LGTM, Thanks