feat(di): introduce Dependency Injection

[dakimura]

WHAT

• refactor: introduce Dependency Injection
• introducing google/wire can make the code less readable and increase the on-boarding cost, so decided to implement a simple DI without using library

[codecov-commenter]

Codecov Report

Merging #606 (4399161) into master (17c3cfe) will increase coverage by 0.03%. The diff coverage is 34.48%.

@@            Coverage Diff             @@
##           master     #606      +/-   ##
==========================================
+ Coverage   48.43%   48.46%   +0.03%     
==========================================
  Files         136      136              
  Lines       12966    12899      -67     
==========================================
- Hits         6280     6252      -28     
+ Misses       6067     6037      -30     
+ Partials      619      610       -9     

Impacted Files	Coverage Δ
cmd/connect/session/local_api_client.go	0.00% <0.00%> (ø)
utils/config.go	1.66% <0.00%> (+0.01%)	:arrow_up:
executor/wal.go	54.19% <33.33%> (-0.06%)	:arrow_down:
executor/instance.go	100.00% <100.00%> (+52.56%)	:arrow_up:
executor/written.go	96.66% <100.00%> (ø)
replication/grpc_server.go	91.42% <100.00%> (ø)