Add deprecation warning for selfdestruct usage

[pcaversaccio]

What I did

Fixes #3277.

How I did it

Add the following warning if selfdestruct is used:

`selfdestruct` is deprecated! The opcode is no longer recommended for use.

I also updated the docs.

How to verify it

Run the following function:

@external
def foo():
    selfdestruct(msg.sender)

Compilation Output

Warning: `selfdestruct` is deprecated! The opcode is no longer recommended for use.
0x61003961000f6000396100396000f360003560e01c346100285763c2985578811861002157600436106100285733ff005b5060006000fd5b600080fda1657679706572830001000a

Commit message

Add deprecation warning for selfdestruct usage

Description for the changelog

Add deprecation warning for selfdestruct usage.

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[codecov-commenter]

Codecov Report

Merging #3372 (5396194) into master (1cfeabb) will decrease coverage by 0.03%.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##           master    #3372      +/-   ##
==========================================
- Coverage   88.81%   88.78%   -0.03%     
==========================================
  Files          84       84              
  Lines       10656    10660       +4     
  Branches     2223     2224       +1     
==========================================
+ Hits         9464     9465       +1     
- Misses        790      791       +1     
- Partials      402      404       +2     

Impacted Files	Coverage Δ
vyper/builtins/functions.py	89.21% <100.00%> (-0.13%)	⬇️

... and 1 file with indirect coverage changes

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