Relates to KT-15562 "Service is dying".
This commit includes multiple changes:
1. JPS & Gradle daemon clients are refactored to use `connectAndLease` from `KotlinCompilerClient`.
`connectAndLease` was introduced in previous commits
2. `withKotlin` was removed because `connectAndLease` already covers retrying on connection error
3. Gradle flag files creation is changed:
* client-alive flag file lives as long as Gradle instance lives,
* session-alive flag file lives until the end of a build.
allows to compile only parts of the source files, denoted by top-level
"sections" (function with lambda param calls), but preserving original
file line/column numbers for easier diagnostics. Allow e.g. to compile
gradle "buildscript" section without preprocessing original file in
advance. See tests for examples.
Alexander Udalov