Faster build time

[nmeylan]

Reduce number of dependencies, evaluate migration of following dependencies:

1. serde -> nanoserde
2. sqlx (serde) -> rust-postgresql
3. regex -> regex_lite
4. flexi_logger (regex) ->

Before

clean build: 1m11s
configuration build: 7s
change in server + build: 10s

After

clean build:
change in server + build:

[nmeylan]

Won't switch to rust-postgresql, using it is too complicated:

• binding parameters is not convenient comparing with sqlx